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?
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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\(^{-1}\)
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\(^{-1}\)