A balloon is rising vertically upward with a uniform
velocity 'u' as shown in Fig. 11.E22. At a certain
instant, a ball No. 1 is dropped from it, which takes a
4 sec to reach the ground. The moment this ball
strikes the ground, another ball is dropped from the
balloon and this 2nd ball takes 5 sec to reach the
ground. Find the velocity of the balloon 'u' and height
from which both the balls must have been dropped.
"h_1=\\frac{gt_1^2}2=80~m,"
"h_2=\\frac{gt_2^2}2=125~m,"
"u=\\frac{h_2-h_2}{t_1}=11. 25~\\frac ms."
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