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
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Initial momentum = (0.8) \times (5)
= 4.0kgms\(^{-1}\)
Final momentum
= (0.8) \times (– 5)
= – 4.0kgms\(^{-1}\)
Impulse on ball
= Change in momentum
= 4.0 – (– 4.0)
= 8.0.0kgms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #47681)