Laws of MotionHard

Question

System is shown in the figure. Velocity of sphere A is 9 m/s. Then speed of sphere B will be:

Options

A.9 m/s
B.12 m/s
C.9 × 5/4 m/s
D.none of these

Solution


9 cosα = v sinα           →        (i)
= tanα            →        (ii)
(R + 5)2 = (12)2 + (19 − R)2        [Pythagorean]
⇒        R = 10
Hence from (i) and (ii)
v = 12 m/s

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