A stone is dropped from a tower of height 3600cm. Find the velocity by which it strike the ground. Also, find the time taken to reach the ground.

Question

Physics

Lainey Hansen

29 November, 06:45

A stone is dropped from a tower of height 3600cm. Find the velocity by which it strike the ground. Also, find the time taken to reach the ground.

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Answers (2)

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Alma Willis · Answer 1

Here h=36m, a=g=10m/s, u=0

Use s=ut + (1/2) at^2

36=0*t + (10t^2) / 2

time=2.68 sec

As from the formula of final velovity, v = (2gh) ^1/2

v = (2*10*36) ^1/2

v = (720) ^1/2

v=26.83 ... This is the final velocity

Lucas Kirby · Answer 2

s = vit + 1/2 gt*2

36 = 0 + 1/2 x 9.8 x t*2

t*2 = 7.34

t = 2.7sec

now,

2gs = vf*2 - vi*2

2 x 9.8 x 36 = vf*2 - 0

vf*2 = 705.6

vf = 26.5m/s