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Q.

A stone is projected up with a velocity of 98 m/sec. It reaches a point P in its path after 7 seconds. It reaches P again after another :

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a

3 s.

b

13 s.

c

6 s.

d

9 s.

answer is C.

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Detailed Solution

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Time of flight T=2Ug=2×989.8=20sec
After 7 sec. it is at ‘h’. Then, again after
(20 - 7) = 13 sec. it will be at ‘h’.
Further time 13 - 7 = 6 sec.

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