Five identical balls each of mass 180gram and radius $r = 1 c m$ are strung like beads at random and at rest along a smooth, rigid horizontal thin rod of length $L = 1 m$ , mounted between immovable supports. Assume 10r < L and that the collision between balls or between balls and supports are elastic. If one ball is struck horizontally so as to acquire a speed $v = 1 m / \sec$ , the average force felt by the support in N is

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Detailed Solution

Time period of collision $= \frac{2 (L - 10 r)}{v}$
Favg = $\frac{2 m v^{2}}{2 (L - 10 r)} = \frac{m v^{2}}{(L - 10 r)}$

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