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Displacement of COM:Application

If the time t...

Question

If the time taken by ball A to fall back on ground is $4$ sec, the maximum height attained by ball A from the ground is:

A

10 m

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B

15 m

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C

20 m

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D

Insufficient information

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Solution

The correct option is C $20 m$
$T = \frac{2 u s i n θ}{g} = 4 s$
$∴ u s i n θ = 20 m / s$
$\Rightarrow$ vertical is 20 m/s for maximum height
$v^{2} = u^{2} + 2 a s \Rightarrow$ $0^{2} = 20^{2} - 2 \times 10 \times s \Rightarrow s = 20 m$

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