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Question

A ball is thrown vertically upwards with a velocity of 10m/s from a height of 4m from the ground. If the air resistance is neglected and g=9.8 m/s2, the time taken by the ball to reach the ground is

A
2.01 s
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B
2.53 s
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C
2.86 s
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D
4.09 s
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Solution

The correct option is D 4.09 s
S=ut12gt2

S=40mandu=10m/s

40=10t9.82t2t=4.09 sec

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