Question
If a ball is dropped from rest . It because from the floor respectively . The coefficient of restitution is 0.5 and the speed just before the first bounce is 5 m/sec. The total time taken by the ball to come to rest is :
Answer: Option C
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`because ` acceleration =`a = (v - u)/(t)`
or `a = (v - v_0)/(t)`
or `g = (v - v_0)/(t)` (considered average force)
`because v = 0`
speed before first bounce
`v_0 `= 5 m/sec`(uarr)`
`:.` t = `(v - v_0)/(g) = (0 - (-5))/(10) = 5/10 = 0.5 sec`
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