In a 100-metre race, Ram ran with a constant acceleration of $0.5 m s^{- 2}$ from start to finish. What was his speed when he was just about to finish the race?

10 m/s

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20 m/s

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30 m/s

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40 m/s

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Solution

The correct option is A 10 m/s
Given:
$u = 0 m / s, s = 100 m, a = 0.5 m s^{- 2}, v = ?$
Using the third equation of motion,
$v^{2} - u^{2} = 2 a s$
$v^{2} - 0^{2} = 2 \times 0.5 \times 100$
$v = 10 m / s$

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