A body of mass 1 kg starts from rest and moves with uniform acceleration. In 2 seconds, its velocity is 10 m/s. The power exerted on the body in one second is (a) 20 W (b) 25 W (c) 50 W (d) 100 W

Answer: (b). a = 10/2 = 5 m/s², so F = ma = 5 N. At t = 1 s: v = at = 5 m/s. P = Fv = 5 × 5 = 25 W So the answer is (b) 25 W.

A body of mass 1 kg starts from rest and moves with uniform… | MHT CET 2024 (15 May, Shift 1)

Q11MHT CET 2024 · 15 MAY · SHIFT 1Easy

Power

A body of mass 1 kg starts from rest and moves with uniform acceleration. In 2 seconds, its velocity is $10\text{ m/s}$ . The power exerted on the body in one second is

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Answer: (b)

$a = \frac{10}{2} = 5\text{ m/s}^2$ , so $F = ma = 5\text{ N}$ .
At $t = 1\text{ s}$ : $v = at = 5\text{ m/s}$ .
$P = Fv = 5 \times 5 = 25\text{ W}$
So the answer is (b) 25 W.

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