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  4. A balloon at height of 81 m is moving upward with 12 m s-1. A 2 kg weight is dropped from it, the time taken by it to reach ground is

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Q. A balloon at height of $81\, m$ is moving upward with $12 m s^{-1}$. A $2 \,kg$ weight is dropped from it, the time taken by it to reach ground is

Motion in a Straight Line

Solution:

Using, $s = ut + \frac{1}{2} gt^2$,
we get 81 = $- 12t +\frac{1}{2} \times 10 \times t^2$
i.e. $t = 5.4 \, s$