Question

A ball is thrown vertically upwards with a velocity of 14 M per second calculate the maximum height which it Rises, the total time it take to return to the surface of the earth​

Answer 1

Initial velocity (u) = 49 m/s Final velocity (v) = 0 m/s

Gravity in toward down = + 9.8 m/s2 Gravity in toward up = - 9.8 m/s2

(i) We know, V2 - u2 = 2gs

or, (o)2- (49)2 = 2 X 9.8 X S

or, s = - (49)2/ 2 X 9.8 = 122.5 m

Maximum height = 122.5 m

(ii) We know, v = u + gt

or 0 = 49 +(- 9.8) X t

or 9.8 X t = 49

or, t = 49/ 9.8 = 5 s

If, time for upward direction = time for downward direction

Then, total time taken by a ball to return back = 5 + 5 = 10 s

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Answer 2

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