Power due to a force acting on a block varies with \( \mathrm{P} \)...

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Power due to a force acting on a block varies with
\( \mathrm{P} \) time \( t \) as shown in figure. Then angle

W between force acting on the block and its velocity is :-
(1) Obtuse at \( \mathrm{t}=1 \mathrm{~s} \)
(2) \( 90^{\circ} \) at \( \mathrm{t}=3 \mathrm{~s} \)
(3) Acute at \( t=7 \mathrm{~s} \)
(4) \( 90^{\circ} \) at \( t=6 \mathrm{~s} \)
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