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akash goyal Grade: 12
`        A steel ball strikes a steel plate at an angle  with the vertical . If the coefficient of restitution is e, the angle at which the rebound will take place is`
8 years ago

## Answers : (1)

S PRASANTH
8 Points
```										Consider the steel plate to be lying on the floor. Let the coefficient of friction between the plate and ball be n. Let the vertical component of velocity be y & horizontal component be x. Let time of collision be t(tending to zero). Final vertical component of velocity after collision is ey.
If average (normal) force during collision is F,
Ft  =  m ( y + ey)            where m is mass of ball
Average frictional force ffriction =   Fn  =  m (y + ey) n  / t
So    m (y + ey) n  =  m  (x - xfinal)
xfinal  =  x - n (y + ey)
Let angle of rebound be a with vertical
tan a =   (   x - n (y + ey)    )   /    ey  =  (tan b) / e   -   n/e     -  n            where b is angle of striking of steel ball with the vertical
```
8 years ago
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