First slide

Instantaneous acceleration

Question

A balloon is rising steadily up with velocity of 19.6 m/s. If a stone is dropped from it, the separation between balloon and the stone after 2 seconds is

Easy

A

19.6 m
B

39.2 m
C

9.8 m
D

25.4 m

Solution

Separation between stone and the balloon is ____
$\frac{1}{2} {gt}^{2} = \frac{1}{2} 9 .8 \times 4 = 19 .6 m$

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