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Grade: 11
        A ball dropped from a balloon at rest clears a tower 81m high during the last quarter second of its journey. Find the height of the balloon and the velocity of the body when it reaches the ground.
Please give the solution
6 years ago

Answers : (1)

Nirmal Singh.
askIITians Faculty
44 Points
							

The last quarter of the jouney menas 1/4th of the total time it requires in its total journey.

Let total time be 4t, u = 0. So, v at 3t = 3gt, and at 4t = 4gt. by v² = u² + 2as, 16g²t² = 9g²t² + 2g(81) 7g²t² = 162g 7gt2 = 162 t² = 162 / 7g t = 1.5 sec. but time is 4t = 6 sec. So velocity on reaching = 4gt = 58.8 m/s With this velocity, height of fall = 2t(58.8) = 705.6m
Regards,
Nirmal Singh
Askiitians Faculty
6 years ago
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