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Friction General Understanding

A body droppe...

Question

A body dropped from a height reaches the ground in $5 s$ . The velocity with which it reaches the ground is ( $g = 9.8 m s^{- 2}$ ):

A

0 m s^{- 1}

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B

49 m s^{- 1}

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C

4.9 m s^{- 1}

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D

9.8 m s^{- 1}

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Solution

The correct option is D $49 m s^{- 1}$
$v = u + g t$
$t = 5 s e c$
$u = 0$
$| v | = 5 g = 5 \times 9.8 = 49 m / s$

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