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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` wattsB. 200 wattsC. 300 wattsD. 400 watts |
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Answer» Correct Answer - 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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