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Q.

A body of mass 1kg  is projected upward with a speed  of 10 m/s. It returns to the point of projection with a speed of 8 m/s.  Air resistance remains constant during the entire Journey of the body. Then maximum height attained by the body is ____

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a

4.1 m

b

3.2 m

c

5 m

d

6.2 m

answer is A.

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Detailed Solution

Let  ‘R’ be the average resistance offered by air.∴     2RH=12 mu2−12 mv2     ........(1)Also,  u2=2g+RmH   .........(2)Solving,   H=v2+u24g=82+1024× 10m=4.1m
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