Power of a force acting on a block varie...

Power of a force acting on a block varies with time t as shown in figure. Then, angle between force acting on the block and its velocity is

Obtuse at `t=1s`

`90^(@)` at `t=3s`

Acute at `t=7s`

Both the stones reach the bottom at different times and with different speeds.

Text Solution

Verified by Experts

The correct Answer is:

Power, `P=vec(F).vec(v)` so
`P` positive `rArrthetalt90^(@)`, `P` negative `rArrthetagt90^(@)`
and `P` zero `rArrtheta=90^(@)`

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