A ball falls under gravity from a height of 10 m with an initial downward velocity 
It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity 
and (ii) the height to which the ball would rise after collision if the initial velocity 
was directed upwards instead of downwards?
a)
b)
c)
d)
A ball falls under gravity from a height of 10 m with an initial downward velocity It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity and (ii) the height to which the ball would rise after collision if the initial velocity was directed upwards instead of downwards?
a)
b)
c)
d)
Question ID - 100230 | SaraNextGen Top Answer
A ball falls under gravity from a height of 10 m with an initial downward velocity It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity and (ii) the height to which the ball would rise after collision if the initial velocity was directed upwards instead of downwards?
a)
b)
c)
d)
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A ball falls under gravity from a height of 10 m with an initial downward velocity |
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a) |
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b) |
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c) |
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d) |
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(b)
TE at initial point 
After collision,remaining energy
Hence, 
(since after collision,it rebounds to same height 
)
m/s
The ball would rise to the same height after collision if the initial velocity was directed upwards instead of downwards. Since while returning to the same point, the body would possess the same velocity in the downwarddirection, hence 
=10 m