A ball is dropped from a rising balloon moving upwards with uniform speed of 7m/s. If the balloon was at a height of 60m at the time of dropping the ball, how long will it take to reach the ground. (With explanation, please.)
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Hight = 60 m
Using equation of motion
-H = Ut - 1/2 gt^2 dude I use sign conversation according to frame of reference
-60= 7t -1/2*10t^2
5t^2 -14t-120 = 0 now it is quadratic in the we can easily find its time t
a=5 , b = -14 ,c= -120
T=[14+√14^2-4×5×-120]\10
T= 6.5 sec it is a calculation I use calculator but answer is correct dude