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Q.

A ball is thrown upward with such a velocity v that it returns to the thrower after 3 s. Take g = 10 ms-2 . Find the value of 'v'

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a

20 m/s

b

15 m/s

c

5 m/s

d

10 m/s

answer is A.

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Detailed Solution

Using h→=  u→t+12a→t2

Since the displacement is zero,

0 = uT -12gt2  ⇒u = gT2

⇒u = 10×32 = 15 m/s

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