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.

JThomson

7 years ago

Momentum = Mass x Velocity
Change in Momentum = Mass x (change in velocity)
Change in Momentum = Mass x (v - u)
Mass = 100g = 0.1kg
U = -10m/s
V = 2m/s since direction is opposite initial direction
Change in momentum = m (v − u)
= 0.1 [2-(-10)]
= 0.1 (12)
= 1.2Ns

dominiontech

7 years ago

The answer is B joor
change is impulse = m(v-u)
mv-mu
(0.1x10)-(-20x0.1)
0.1x12
change in momentum=1.2Ns