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A ball is dropped from a balloon going up at a speed

Question:

A ball is dropped from a balloon going up at a speed of $7 \mathrm{~m} / \mathrm{s}$. if the balloon was at a height $60 \mathrm{~m}$ at the time of dropping the ball, how long will the ball take in reaching the ground?

Solution:

$\mathrm{u}=7 \mathrm{~m} / \mathrm{s} ; \mathrm{a}=-\mathrm{g} ; \mathrm{s}=-60$

$\mathrm{s}=u t^{\frac{1}{2}} a t^{2}$

$-60=7 t^{\frac{1}{2}}(g) t^{2}$

$\mathrm{t}=4.28 \mathrm{sec}$

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