A body of mass 100g moving with a velocity of 10.0ms-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
Initial momentum = 0.1 x 10 = 1Ns
final velocity = -2ms-1
Final momentum = -2 x 0.1 = -0.2Ns
Change in momentum = -0.2 – 1 = -1.2Ns