(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A balloon is at a height of 81 m is ascending upward with a velocity of 12 ms1. A body of 2 kg weight is dropped from it. If g = 10 ms2, the body will reach the surface of earth in what time.

2. Relevant equations

3. The attempt at a solution

I don't think mass is of any importance in this question. Hence, I tried to solve it this way:

Since initial velocity = -u

(s=ut+1/2at^2)

81 = -12t+1/2*10*t^2

Solving, we have t = 42seconds.

However this is not the answer. Please explain how I solve this question.

Thanks in advance

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# Homework Help: Problem on Kinematics

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