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CBSE Class 11-science Answered

NUMERICAL QUESTION BASED ON THE MOTION UNDER GRAVITY
Asked by | 04 Dec, 2008, 03:30: PM
Expert Answer

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.

 

 

Answered by | 06 Dec, 2008, 11:22: AM
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