Q.

A stone is projected vertically up from ground ,at half of maximum height its velocity 20 m/s. then maximum height attained by the stone   g=10m/s2

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a

20 m

b

40 m

c

60 m

d

80 m

answer is B.

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Detailed Solution

Let ‘H’ be the heightvelocity at half of maximum height is v=u/2 =20  m/s maximum height = u 2/2 g  =800/20 =40 m
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A stone is projected vertically up from ground ,at half of maximum height its velocity 20 m/s. then maximum height attained by the stone   g=10m/s2