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A ball of mass 1kg is dropped from 20m height on ground and it rebounds to height 5m. Find magnitude of change in momentum during its collision with the ground

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3 years ago

sagar kumar
99 Points
```							To solve, the problemfirst, of alluse the 3rd equation to find the value of v (where put the value of u=o, s=20m, g=9.8ms-2) you will get the value of vafter that, again use the third equation to find the u while rebounding (where put the value of v=0 ,s=5m,g=9.8m/s2) you will get the value of u thereafter you must be knowing that, Impulse = change in momentumthen put , mv-(mu) =mv+mu=m(v+u) then put the values of m,v,u you will get the magnitude and change in momentum......
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3 years ago
Khushi
19 Points
```							for downward motion ;u=0 m/sa=10 m/s2s=20 musing v2- u2=2asv= 20m/sfor upward motion;v=0 m/sa=10 m/s2s=5 m using v2 – u2=2asu= -10 m/sI=mv – muI=20+10=30 kg m/s
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3 years ago
pooja kapgate
21 Points
```							1stly consider coefficient of restitution e^1/2 then apply          v^2=2gh           =2×10×20      =400  V=20m/s Then v`/v=e^1/2           If v =20 then v`=10 so  V`+v=20+10=30m/sNow , p=mv              =30×1=30 kg m/s
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3 years ago
Yash Chourasiya
256 Points
```							Dear StudentA ball of mass 1 kg dropped from 20 m height on ground and it rebounds to height 5.Using energy conservation theorem:mgh = ½(mv2)v = √2ghwhere, g = 10 m/s² and h = 20 mv = √2*10*20v = 20 m/secMomentum before collision = mv                       = 1 x 20                      = 20 kgm/sAfter rebounding the ball.Using energy conservation theorem:mgh = ½(mv2)v = √2ghwhere, g = 10 m/s² and h = 5 mv = – √2*10*5v = – 10 m/secMomentum after collision = mv                       = -1 x 10                      = -10 kgm/sChange in momentum during collision = After collision - Before collision                                  = 20 - (-10)                                  = 30 kgm/secHence, The change in momentum is 30 kgm/secI hope this answer will help you.Thanks & RegardsYash Chourasiya
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6 months 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