A body of mass 100g moving with a velocity of 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: Option B
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 (2 -(- 10))
= 0.1 (12)
= 1.2Ns
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