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When a 2 kg car driven at 20 m//s on a l...

When a `2` kg car driven at `20 m//s` on a level road is suddenly put into netural gear (i.e. allowed to coast), the velocity decreases in the following manner:
`V=20/(1+(t/20))m//s`
Where t is time in sec. The deceleration of car at the instant its speed is `10 m//s` is.

A

`5` watt

B

`10` watt

C

`15` watt`

D

`20` watt

Text Solution

Verified by Experts

`F=m(dV)/(dt)V`
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