7. A helicopter takes off and at height of 500m
a stone is dropped which reaches on
surface of earth after 6s. What was the
velocity of the helicopter when the stone w
dropped? (g = 10 m/s') Ans. 53.33 ms
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n the given question, the stone is thrown upwards from a height of 500 meters from a moving helicopter and it reaches the ground after 6 seconds. What we have to find is the velocity.
Height h is given, time t is given and putting it all in h = ut+1/2gtsqaure, we get u and then we use it in v square – u square = 2gh and get the value of v.
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