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A stone is projected vertically with a speed of 10 m/s from ...

A stone is projected vertically with a speed of 10 m/s from a point 8 metres above the ground. Find the maximum height reached. [g=10ms2].

A.

13 metres

B.

15 metres

C.

18 metres

D.

23 metres

Correct answer is A

v2=u2+2as

v2=u22gs

0=1022(10)s100=20s

s=5m+8m=13m (8m is the height from where it was thrown)