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A ball is thrown vertically upwards with an initial velocity of 5 m/sec from point P as shown. Q is a point 10 m vertically below the point P. Then the speed of the ball at point Q will be : (take g = 10 m/s2 and neglect air resistance)

(A) 7.5 m/sec

(B) 10 m/sec

(C) 15 m/sec

(D) 17.5 m/sec

1 Answer

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Correct option (C) 15 m/sec


v2 = u2 + 2 as 

v2 = (5)2 + 2 × 10 × 10 

v2 = 25 + 200 

⇒ 225 

v = 15m/sec

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