Question

If a stone is tied with a balloon and left to go upward. The speed of balloon is 5m/s. At a certain height of 10 meter the rope is cut down. Find the time taken by the stone to reach the ground.

Answer 1

Answer:

2s

Explanation:

velocity=displacement / time

Answer 2

Answer:

At time when balloon and stone detach velocity of stone will be 5 m/s upward so it will have to cover more than 10 m.

$time \: of \: flight \: = \: \frac{2u}{g} + \sqrt{ \frac{2h}{g} } \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{2 \times 5}{10} + \sqrt{ \frac{2 \times 10}{10} } \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: 1 + \sqrt{2}$

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