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The velocity of a block of mass 2kg movi...

The velocity of a block of mass `2kg` moving along `x-` axis at any time `t` is givne by `v=20-10t(m//s)` where `t` is in seconds and `v` is in `m//s`. At time `t=0`, the block is moving in positive `x-` direction.
The power due to net force on force on block at `t=3 sec. `is `:`

A

`100` watts

B

200 watts

C

300 watts

D

400 watts

Text Solution

Verified by Experts

The correct Answer is:
B
At `t=3 sec.` force on particle is `F=ma =2xx10` towards `-ve x-` direction
At` t=3 sec.` the velocity of particles is `v=10m//s` towards `-ve x-` direction
`P=FV=200 ` watts `Ans.`
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