A tennis ball Moving with a speed of tm/sec strike a wall head-on and rebounds f

Question

A tennis ball Moving with a speed of tm/sec strike a wall head-on and rebounds from it with the same speed. If the mass of the ball in 100 gm, the change in momentum of the ball, in gm-m/sec will be 50 100 200 105 Ans A bullet of mass m and velocity v strikes a large wooden black of mass M suspended from a string of length I . The block is initially at rest The bullet sticks in the block. Using the conservation of momentum and conservation of energy, we deduce that the block will swing up a height. v2/2g(m/m+M) v2/2g(m/m+M)2

Explanation / Answer

(Delta P = mDelta v = m(v_1 - v_2); ; v_2 = -v_1) Answer: c By conservation of momentum and energy: (sqrt{2gh} = rac{mv}{m+M}) Answer: c

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