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  4. A ball of mass 1 kg collides with a wall with speed 8 ms -1 and rebounds on the same line with the same speed. If mass of the wall is taken as infinite, the work done by the ball on the wall is

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Q. A ball of mass $1\, kg$ collides with a wall with speed $8\, ms ^{-1}$ and rebounds on the same line with the same speed. If mass of the wall is taken as infinite, the work done by the ball on the wall is

Work, Energy and Power

Solution:

Here the force acts and point of application of force does not move.
$\Rightarrow \quad W=F s \cos \theta=F(0) \cos \theta=0$