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`        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

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/sAverage force = 2 / (40 * 0.001) = 50 N = 5 mega dynes
```
2 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions