## Answers

Initial Speed of the stone u = 20 m/s

Height of the building H = 50 m

(a)

Time needed to reach maximum height ta = u/g = 20/9.8 =2.04 s

(b)

Velocity at t = 5s, v = 9.8 * (5 - 2.04) = 9.8 * 2.96 = 29.008 m/s

Time taken to reach the point which is at the same level to the top of the

building t' = 2ta = 4.08 s

Position of the stone at t = 5s, = (1/2)(9.8)(5 - 4.08) = 4.9*0.92 = 4.508 m from the top of the building.

Position of the stone from ground, Y = 50 - 4.508 = 45.492 m

.

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