How long should a force of 100 N act on a body of 20 kg, so that it acquires a velocity of $100 m s^{- 1}$ ?

30 s

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10 s

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20 s

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15 s

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Solution

The correct option is D $20 s$
$F = m a$
$a = \frac{F}{m}$
$a = \frac{100}{20}$
$a = 5 m s^{- 2}$
$v = u + a t$
$100 = 0 + 5 \times t$
$t = 20 s$

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How long should a force of 100 N act on a body of 20 kg, so that it acquires a velocity of 100 ms−1?

The correct option is D 20 sF=maa=Fma=10020a=5 ms−2v=u+at100=0+5×tt=20 s

How long should a force of 100 N act on a body of 20 kg, so that it acquires a velocity of $100 m s^{- 1}$ ?

The correct option is D $20 s$
$F = m a$
$a = \frac{F}{m}$
$a = \frac{100}{20}$
$a = 5 m s^{- 2}$
$v = u + a t$
$100 = 0 + 5 \times t$
$t = 20 s$