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Acceleration

A food packet...

Question

A food packet is released from a helicopter rising steadily at the speed of $2 m / s$ . After $2$ seconds the velocity of the packet is (Take $g = 10 m / s^{2}$ ):

22 m / s

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20 m / s

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18 m / s

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None of these

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Solution

The correct option is C $18 m / s$
The food packet has an initial velocity of $2 m / s$ in upward direction, therefore
$v = - u + g t$ or
$v = - 2 + 10 \times 2 = 18 m / s$

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