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An object is dropped is an unknown plane...

An object is dropped is an unknown planet from height 50 m, it reaches the ground is 2 s. The acceleration due to gravity in this unknwon planet is

A

`20ms^(-2)`

B

`25ms^(-2)`

C

`15ms^(-2)`

D

`30ms^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`s=ut+(1)/(2)at^(2),u=0`
`a=(2s)/(t^(2))=(2xx50)/((2)^(2))=25ms^(-2)`.
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