A a certain instant of time a ballon is ...

A a certain instant of time a ballon is moving downwards with speed of 5m/s. It has a constant retardation of `5m//s^(2)`. A man in the ballon drops a stone at that instant. It hits the ground after 2s. Then the speed with which the stone hits the ground is.

15m/s

25m/s

55m/s

35m/s

Text Solution

Verified by Experts

`vecv=vecu+vecat`
`=4(-hatj)+g(-hatj)xx2`
`=25(-hatj)`

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