First slide

Release from certain height

Question

A packet is released from a balloon which is rnoving upward when the balloon is at a height 200 m above ground. The packet reaches the ground in 8 sec. Speed of the balloon when the packet is released, is: (take g = 10 m/s)²

Moderate

A

18 m/s
B

15 m/s
C

12 m/s
D

9 m/s

Solution

By using $s = ut + \frac{1}{2} {at}^{2}$
we have $- 200 = u (8) + \frac{1}{2} (- 10) {(8)}^{2}$
u=15 m/s

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