JAMB - Physics (2018 - No. 43)
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?
0kgm
2kgm/s
4kgm/s
8kgm/s
Penjelasan
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\(^{-1}\)