CBSE Class 11-science Answered
Assume upward direction is positive and downward direction is negative.
1.In this case if the balloon is ascending initial velocity is u = +5m/s
h = -300m, a = -9.8m/s^2.
use s = ut+1/2at^2 and solve t.
2. when the balloon descends initial velocity u = -5m/s as this is in the downward direction.
Let us take upward direction as positive and downward direction as negative.
s=ut+1/2at^2 to find t.
3. here take u =0 and then solve for t.
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