Question

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

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

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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