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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

A

acute at = 1 s

B

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

C

obtuse at t = 7 s

D

change in kinetic energy from t = 0, to t = 10 s is 20 J

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The correct Answer is:
A, C, D
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