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A basketball has a mass of 0.62 kg. When dropped from a height of 3.5 m,...

A basketball has a mass of 0.62 kg. When dropped from a height of 3.5 m, it hits the ground with a speed of 7.3 m/s. Calculate (a) the ball's initial potential energy and (b) its final kinetic energy. If your answers to parts (a) and (b) are different, explain why.

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Answer #1

Given, m = 0.62 kg, hi = 3.5 m, hf  = 0 m and vf  = 7.3 m/s

(a) Ball's initial potential energy :  

(b) Ball's final kinetic energy :

Answers in part (a) and (b) are different.

Explanation :

Maybe the energy is lost due to the drag force of the air. The surface of ball is rough, due to which a drag force is generated by the air surrounding it, and due to the friction between air and ball, the energy is lost in the form of heat.

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