A ball falls from a height of 5m and strikes the roof of a lift. If at the time of collision, lift is moving in the upward direction with a velocity of 1m/s, then the velocity with which the ball rebounds after collision will be :
A
11m/s downwards
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B
12m/s upwards
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C
13m/s upwards
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D
12m/s downwards
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Solution
The correct option is C12m/s upwards Velocity of ball before collision=√2gh=√2×10×5=√100=10m/s