A balloon is going upwards with velocity 12 m/s. It releases a packet when it is at a height of 65 m from the ground. How much time will the packet take to reach the ground if g=10 m/s2?

Given:

The upward direction is taken as negative and the downward direction is taken as positive.

u=-12 m/s

h=65m

g=10 m/s<sup>2</sup>

v=0 m/s

From second equation of motion,

h=ut+1/2gt<sup>2</sup>

65= -12+1/2(10t<sup>2</sup>)

t=-13/5 and 5

Therefore, time taken to reach the ground is 5 seconds.

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