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Question

A stone is dropped from a height of 100 m from the ground. Take accelaration due to gravity as 9.8 m/s2.
Calculate:
(a) The velocity with which it reaches the ground.
(b) The time taken to reach the ground.     [3 MARKS]


Solution

Finding Velocity : 1.5 Marks
Finding Time : 1.5 Marks

(a) Here,
u=0, s=100 m, a=9.8 m/s2
v2=u2+2as
v2=0+2×9.8×100
v2=1960
v=44.3 m/s

(b)   v=u+at
44.3=0+9.8t
t=44.39.8=4.52 s

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