Answer: B - Rachel gave the ball 72 joules of energy with her kick. The kinetic energy of an object is given by ½*mv2. In this case, the mass is 1 kg and the velocity is 12 meters/second. Thus, the energy in the ball (that Rachel had to give) is 144*1*1/2 = 72 joules.

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Praxis II General Science

Category - Physics

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Rachel has just kicked a kickball weighing 1 kg. If the kickball is moving at a speed of 12 m/s, how much energy did Rachel give the ball with her kick?

36 joules
72 joules
100 joules
120 joules
148 joules

Explanation

Answer: B - Rachel gave the ball 72 joules of energy with her kick. The kinetic energy of an object is given by ½*mv². In this case, the mass is 1 kg and the velocity is 12 meters/second. Thus, the energy in the ball (that Rachel had to give) is 144*1*1/2 = 72 joules.

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