Q.
A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm/sec collides elastically with first ball. After collision the smaller ball moves with speed of (cm/s)
see full answer
Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!
Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya
answer is 144.
(Unlock A.I Detailed Solution for FREE)
Ready to Test Your Skills?
Check your Performance Today with our Free Mock Test used by Toppers!
Take Free Test
Detailed Solution
Ratio in radius of steel balls = 1/2So, ratio in their masses =18 [As M∝V∝r3]Let m1=8m and m2=mv2=2m1u1m1+m2=2×8m×818m+m=144 cm/s
Watch 3-min video & get full concept clarity