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Potential Energy

A ball of mas...

Question

A ball of mass 2kg is projected vertically up with a speed of 2 m/s and it comes back to the ground with a speed of 1m/s. The work done by air friction force is

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Solution

$D e a r s t u d e n t a t t h e p o i n t o f t h r o w i n g, (l e t u s t a k e t h i s p o i n t t o b e P E = 0) N e t e n e r g y = K E o n l y = \frac{1}{2} m v^{2} = \frac{1}{2} 2 \times 4 = 4 J a t t h e s a m e p o i n t w h e n t h e c a l l r e t u r n s, N e t e n e r g y = K E o n l y = \frac{1}{2} m v^{2} = \frac{1}{2} 2 \times 1 = 1 J E n e r g y l o s t = 3 J T h i s i s t h e a m o u n t o f w o r k d n e b y t h e a i r f r i c t i o n r e g a r d s$

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