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Second Law of Motion

A block of ma...

Question

A block of mass $1$ $k g$ starts moving with constant acceleration $a = 4 m / s^{2} .$ . Find the instantaneous power of the net force at $t = 4 s$ .

64 W

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6.4 W

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62 W

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6.2 W

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Solution

The correct option is A $64 W$
Instantaneous power of the net force at $t = 4 s$
$= P = F v = (m a) (a t)$
$= m a^{2} t = 1 \times 4^{2} \times 4 W = 64 W$

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