A body of mass 100g moving with a velocity if 10ms-1 collides with a wall. If after collision it moves with a velocity of 2.0ms−1 in the opposite direction, calculate the change in momentum.
A. 0.8Ns B. 1.2Ns C. 12.0Ns D. 80.0Ns
Correct Answer: A
Explanation
Momentum = Mass x Velocity Change in Momentum = Mass x (change in velocity) Change in Momentum = Mass x (v - u) Mass = 100g = 0.1kg U = 2ms\(^{-1}\) V = 10ms\(^{-1}\) Change in momentum = m (v − u) = 0.1 (10 − 2) = 0.1 (8) = 0.8Ns
