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1st Equation of Motion

With what vel...

Question

With what velocity should a ball be thrown vertically upward with so that it reaches a height of $40 m$

7 m s^{- 1}

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14 m s^{- 1}

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21 m s^{- 1}

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28 m s^{- 1}

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Solution

The correct option is D $28 m s^{- 1}$
When the ball is at its peak its final velocity is zero
$0^{2} = u^{2} + 2 \times (- 10) \times 40 u^{2} = 800 u = 28.3 ≅ 28 m / s$

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