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Question

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


A
7ms1
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B
14ms1
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C
21ms1
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D
28ms1
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Solution

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

Physics

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