An object starts from rest and has a uniform acceleration of $4 m s^{- 2}$ . What will be its velocity at the end of half a meter?

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Solution

$G i v e n, u = 0, a = 4 m s^{- 2},$ $s = \frac{1}{2} m e t r e, v = ?$

Using the third equation of motion,

$v^{2} = u^{2} + 2 a s$

$v^{2} = 0^{2} + 2 \times 4 \times \frac{1}{2}$

$v^{2} = 4$

$v = \sqrt{4}$

$= 2 m s^{- 1}$

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