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Q.

Work done by an applied force of 20 N on a body moving on a rough horizontal plane with a uniform velocity of ${20ms}^{- 1}$ in one second is

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a

20 J

b

40 J

c

400 J

d

0 J

answer is C.

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Detailed Solution

Force F = 20N, Velocity v = {20ms}^{- 1}, time t = 1s

$Work done W = FS = F \times v \times t$

$W = 20 \times 20 = 400$

$W = 400J$

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