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 – 8kgm/s

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