In a closed system, an object with a mass of 10 kg moves at a velocity of 5.4 m/s. It collides with a second object that has a mass of 12 kg and that is moving in the opposite direction with a velocity of 3.5 m/s. What is the total momentum of the system after the collision?(1 point)

Question

Responses

66 kg-m/s

42 kg-m/s

12 kg-m/s

54 kg-m/s

Answer 1

To calculate the total momentum of the system after the collision, we need to find the individual momenta of both objects and then add them together.

The momentum of an object is given by the equation p = mv, where p is momentum, m is mass, and v is velocity.

For the first object with a mass of 10 kg and velocity of 5.4 m/s, the momentum is:
p1 = (10 kg)(5.4 m/s) = 54 kg·m/s

For the second object with a mass of 12 kg and velocity of 3.5 m/s (moving in the opposite direction), the momentum is:
p2 = (12 kg)(-3.5 m/s) = -42 kg·m/s
(Note that the negative sign indicates the opposite direction)

To find the total momentum, we add the two momenta together:
Total momentum = p1 + p2 = 54 kg·m/s + (-42 kg·m/s) = 12 kg·m/s

Therefore, the total momentum of the system after the collision is 12 kg·m/s. The correct answer is 12 kg-m/s.

Answer 2

Which student is using innovative problem-solving to investigate potential energy and kinetic energy?(1 point)
Responses

Meghan replicates a demonstration of potential energy and kinetic energy she found in her science textbook.

Pedro researches potential and kinetic energy at the library and writes a report on the relationship between them.

Lisa thinks about ways that potential energy and kinetic energy occur in her own life, chooses one, and designs a demonstration to show the relationship between the two kinds of energy.

William searches the internet for experiments involving potential and kinetic energy, chooses one, and carries it out.

abc or d

Answer 3

The student who is using innovative problem-solving to investigate potential energy and kinetic energy is Lisa. She is thinking about ways that potential energy and kinetic energy occur in her own life, choosing one, and designing a demonstration to show the relationship between the two kinds of energy. This demonstrates creativity and thinking outside the box in order to explore and understand the concepts of potential and kinetic energy.