A body initially at rest travels a distance 100 m in 5 s with a constant acceleration. Calculate the final velocity at the end of 5 s.

10 m s^{- 1}

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20 m s^{- 1}

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40 m s^{- 1}

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80 m s^{- 1}

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Solution

The correct option is C $40 m s^{- 1}$
$s = u t + (1 / 2) a t^{2}$
$100 = (1 / 2) \times a \times 5^{2}$
$a = 8 m / s^{2}$

$v = u + a t$
$v = 0 + 8 \times 5 = 40 m s^{- 1}$ .

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A body initially at rest travels a distance 100 m in 5 s with a constant acceleration. Calculate the final velocity at the end of 5 s.

The correct option is C 40ms−1s=ut+(1/2)at2100=(1/2)×a×52a=8 m/s2v=u+atv=0+8×5=40ms−1.

The correct option is C $40 m s^{- 1}$
$s = u t + (1 / 2) a t^{2}$
$100 = (1 / 2) \times a \times 5^{2}$
$a = 8 m / s^{2}$

$v = u + a t$
$v = 0 + 8 \times 5 = 40 m s^{- 1}$ .