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Q.

From a balloon moving vertically upwards with a uniform velocity of 5 m/s, a stone is  released when it is at a height of 100 m. The time taken by the stone to reach the ground is

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a

6 s

b

4 s

c

5 s

d

8 s

answer is B.

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Detailed Solution

h=−ut+12gt2

100=−5t+5t2t2−t−20=0t=5s

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