Question

As shown below, an object with a mass of 5 kg is moving at a speed of 10 m/s. Another object with a mass of 10 kg is moving at a speed of 5 m/s. Which of the objects has higher kinetic energy?
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1 point

A. The objects have equal kinetic energy.

B. The 5 kg object has higher kinetic energy.

C. The 10 kg object has higher kinetic energy.

D. Both objects have zero kinetic energy.

Answer 1

To calculate the kinetic energy (KE) of an object, we can use the formula KE = 0.5 * mass * speed^2.

For the first object with a mass of 5 kg and a speed of 10 m/s, the kinetic energy is:
KE1 = 0.5 * 5 kg * (10 m/s)^2 = 0.5 * 5 kg * 100 m^2/s^2 = 250 J

For the second object with a mass of 10 kg and a speed of 5 m/s, the kinetic energy is:
KE2 = 0.5 * 10 kg * (5 m/s)^2 = 0.5 * 10 kg * 25 m^2/s^2 = 125 J

Therefore, the first object with a mass of 5 kg moving at a speed of 10 m/s has a higher kinetic energy.
Therefore, the correct answer is B. The 5 kg object has higher kinetic energy.