1. You are told 3 things...1. That there are two objects with equal masses. 2. Both objects are in motion. 3. One object has a greater kinetic energy than the other. How is this possible? (1 point)%0D%0AResponses%0D%0A%0D%0AOne object is blue and one object is red.%0D%0AOne object is blue and one object is red.%0D%0A%0D%0AOne object has a greater volume than the other object.%0D%0AOne object has a greater volume than the other object.%0D%0A%0D%0AOne object has a greater speed than the other object.%0D%0AOne object has a greater speed than the other object.%0D%0A%0D%0AOne object has a greater density then the other object.

Question

2. A large truck and a small car are moving at the same speed, traveling up and down hills, and over bumpy roads. Which one has more kinetic energy?(1 point)%0D%0AResponses%0D%0A%0D%0AThe truck has less kinetic energy because it has greater mass.%0D%0AThe truck has less kinetic energy because it has greater mass.%0D%0A%0D%0AThe car has more kinetic energy because it moves fast down hills.%0D%0AThe car has more kinetic energy because it moves fast down hills.%0D%0A%0D%0AThe truck has more kinetic energy because it has a greater mass. %0D%0AThe truck has more kinetic energy because it has a greater mass. %0D%0A%0D%0AThe car and truck have the same kinetic energy.

3. Which object has the greatest kinetic energy?(1 point)%0D%0AResponses%0D%0A%0D%0Aa green car with a mass of 500kg moving at 21 m/s%0D%0Aa green car with a mass of 500kg moving at 21 m/s%0D%0A%0D%0Aa yellow car with a mass of 500 kg moving at 12 m/s%0D%0Aa yellow car with a mass of 500 kg moving at 12 m/s%0D%0A%0D%0Aa blue car with a mass of 500 kg moving at 30 m/s%0D%0Aa blue car with a mass of 500 kg moving at 30 m/s%0D%0A%0D%0Aa red car mass of 500 kg moving at 3 m/s%0D%0Aa red car mass of 500 kg moving at 3 m/s

4. Use the image to answer the question.An illustration shows a person running after a rabbit. The person weighs 60 kilograms, and the rabbit weighs 4 kilograms. The speed of both is 5 meters per second.A wildlife keeper is trying to catch an escaping rabbit. Who has the greater kinetic energy, the rabbit or the wildlife keeper?(1 point)ResponsesThe wildlife keeper because they have a greater mass.The wildlife keeper because they have a greater mass.The wildlife keeper because they speed up and catch the rabbit.The wildlife keeper because they speed up and catch the rabbit.The rabbit because it has less mass.The rabbit because it has less mass.Neither one because they are moving at the same speed.

5. A skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, then 30 m/s. His acceleration slows until he reaches a constant speed of 50 m/s. Which statement accurately describes his kinetic energy while falling?(1 point)%0D%0AResponses%0D%0A%0D%0AHis kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.%0D%0AHis kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.%0D%0A%0D%0AHis kinetic energy increased quickly at first, then it increased at a constant rate.%0D%0AHis kinetic energy increased quickly at first, then it increased at a constant rate.%0D%0A%0D%0AHis kinetic energy would remain the same for the whole fall as long as he lost no mass.%0D%0AHis kinetic energy would remain the same for the whole fall as long as he lost no mass.%0D%0A%0D%0AHis kinetic energy increased while his speed increases, then it became constant.%0D%0AHis kinetic energy increased while his speed increases, then it became constant.

Answer 1

Here are the most accurate responses for each of the questions presented:

1. How is it possible for two objects with equal masses to have one with greater kinetic energy?

   • Response: One object has a greater speed than the other object.
     (Kinetic energy is given by the formula \( KE = \frac{1}{2}mv^2 \), so if the speeds are different, even with equal mass, the kinetic energy can differ.)

2. Which has more kinetic energy, the truck or the car?

   • Response: The truck has more kinetic energy because it has a greater mass.
     (The kinetic energy depends on mass and speed; the truck, being larger, has greater mass.)

3. Which object has the greatest kinetic energy?

   • Response: A blue car with a mass of 500 kg moving at 30 m/s.
     (Calculating kinetic energy: \( KE = \frac{1}{2}mv^2 \) — the blue car has the highest speed, leading to the greatest kinetic energy.)

4. Who has greater kinetic energy, the rabbit or the wildlife keeper?

   • Response: The wildlife keeper because they have a greater mass.
     (Kinetic energy depends on mass and speed; even though they are moving at the same speed, the keeper's greater mass gives him more kinetic energy.)

5. How does the kinetic energy of the skydiver change while falling?

   • Response: His kinetic energy increased while his speed increases, then it became constant.
     (As the skydiver's speed increases during free fall, his kinetic energy increases, and once he reaches terminal velocity, it remains constant.)

These responses are consistent with the principles of physics relating to mass, speed, and kinetic energy.