JEE Main Physics question

A ball hits a vertical wall horizontally at 10 m/s and bounces back at 10 m/s [JIPMER 1999]

(A)There is no acceleration because 10 m/s − 10 m/s = 0
(B)There may be an acceleration because its initial direction is horizontal
(C)There is an acceleration because there is a momentum changeCorrect
(D)Even though there is a change in momentum there is no change in direction. Hence it has no acceleration

Answer: (C)

Solution

Although the speed is unchanged, the direction (and hence the velocity vector) reverses, giving a momentum change ΔP = 2mv. Since force

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Question ID VK-154046