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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