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Question

A ball is dropped from a balloon going up at a speed of 5m/s. If the balloon was at a height 60m at the time of dropping the ball, how long will the ball take to reach the ground?

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Solution

Vb,g=5m/s (velocity of ball w.r.t ground)
H=60m
s=ut12gt2
60=5t5t2
t2+t12=0
t2+4t3t12=0
t(t+4)3(t+4)=0
t=3s

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