A body moves at a speed of $10 m s^{- 1}$ after gaining an acceleration of $5 m s^{- 2}$ for $2 s$ . What was its initial velocity?

0

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5 m s^{- 1}

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2 m s^{- 1}

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2.5 m s^{- 1}

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Solution

The correct option is A $0$
$v = u + a t$
Final velocity, $v = 10 m s^{- 1}$
Acceleration, $a = 5 m s^{- 2}$
Time, $t = 2 s$
$∴$ $10 = u + 5 \times 2$
or, $u = 10 - 10 = 0$
Initial velocity was $0$ .

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