Physics

Problem

A balloon is going upwards with a velocity

12 \text{ m s}^{-1}

. It releases a packet when it is at a height of

65 \text{ m}

from the ground. How much time the packet will take to reach the ground if

g = 10 \text{ m s}^{-2}

? (A)

1 \text{ s}

(B)

2 \text{ s}

(C)

4 \text{ s}

(D)

5 \text{ s}