1.

The displace ment of a body at any time t after starting is given by `s=10t-(1)/(2)(0.2)t^2`. The velocity of the body is zero after:A. 50 sB. 100 sC. 80 sD. 40 s

Answer» Correct Answer - A
`v=(ds)/(dt)=10-0.2t`
For `v=0`
`t=(10)/(0.2)=50`sec


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