A small object is sliding along a level surface with negligible friction, and ha

Question

A small object is sliding along a level surface with negligible friction, and has mass m, and constant speed v_0, when it collides with a brick resting on the surface. If the object recoils backward at (v_0)/3, and is in contact with the brick for time delta t, what average force did the brick exert on the object? Assume the object is moving along x-direction.

A. F_net = 0
B. F_net= -((mv_0)/delta t)
C. F_net = -((4mv)/(3delta t))
D. F_net = -((mv_0)/ delta t)
E. F_net = -((3mv_0)/(2delta t))
F. F_net = -((2mv_0)/(3delta t))

Explanation / Answer

p = m v = m(-v_0 - ((v_0)/3)) = -4 m (v_0)/3

F_net = P/t = (-4 m (v_0)/3)/(t) = (-4 m (v_0)/(3 t)

Correct answer is C

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