A solid iron ball A of radius r collides head on with another stationary solid iron ball B of radius 2r. The ratio of their speeds just after the collision (e = 0.5) is :
Text Solution
Verified by ExpertsThe correct answer is:
C
M A = ρ × 
π r 3 e = 
M B = ρ × 
π (2r) 3 = 8M A
m A v + 0 = m A v 1 + m B v 2 .........(i)
ev = v 2 – v 1 .........(ii)
Adding (i) + (ii)
= 9v 2 = v + 
= 
∴ v 1 = v 2 – 
= 
– 
= – 
∴ 
= 
= 2.
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