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Grade: 11
        a ball moving with a velocity 20m/s has a mass of 50gm.  if collides against a wall normally and is rebounded normally with the same speed.  if the time of impact of the ball and the wall is 40 mili seconds, the average force exerted on wall in dunes is
2 years ago

Answers : (1)

Karan Gupta
51 Points
							
Change in velocity = 20 m/s – (-20 m/s) = 40 m/s
Change in momentum of ball = 0.05 * 40 = 2 kg-m/s
Average force = 2 / (40 * 0.001) = 50 N = 5 mega dynes
2 years ago
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