# A stone is droppe

Height, s=20m

Initial velocity, u=0

Acceleration due to gravity, g=10m/s2

Final velocity, v=?

Time taken, t=?

(i) Using relation,

s = ut + gt2

20 = 0 * t + * 10 * t2

20 = 0 + 5t2

t2 = = 4

t = 2s

(ii) For a freely falling body:

v2 = u2 + 2gh

= (0)2 + 2 * (10) * (20)

= 400

v = 20m/s

Thus, the speed of the stone when it hits the ground is 20m/s.

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