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A stone is thrown vertically upwards and returns to the starting point at the ground in 6 sec. Find out max. height and initial velocity of stone.
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(i)

Given:

t=6ss=0a=19.8m/s2s=ut+12at20=u×64.9×36u=29.4m/s

(ii)

v=0;s=Hv2=u2+2as0=29.42+2(9.8)×HH=44.1m

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