A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?
-
A.
0kgm -
B.
2kgm/s -
C.
4kgm/s -
D.
8kgm/s
Correct Answer: Option D
Explanation
Initial momentum = (0.8) × (5)
= 4.0kgms(^{-1})
Final momentum
= (0.8) × (– 5)
= – 4.0kgms(^{-1})
Impulse on ball
= Change in momentum
= 4.0 – (– 4.0)
= 8.0.0kgms(^{-1})
There is an explanation video available below.