Question

A ball is dropped from a balloon going up at a speed of 7 m/s. If the balloon was at a height of 60 m at the time of dropping the ball, how long will the ball take in reaching the ground.

Answer 1

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Given

U = 7 m/s

V = 0

a = g ( 10 m/${s}^{2}$ )


Use the first equation of motion


V = u + at


0 = 7 + 10 ×t


t = $\frac{0-7}{10}$


t = -0.7



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Hope this helps . . . . . .