Two blocks of masses mA=10 kg and mB=15 kg initially moving in the same direction with velocities of uA=3 m/s and uB=6 m/s collide elastically. What is the velocity of the block of mass 10 kg after the collision?
A
7.2 m/s
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B
0.8 m/s
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C
8.2 m/s
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D
6.6 m/s
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Solution
The correct option is D6.6 m/s We have, mA=10kg,mB=15kguA=3m/s,uB=6m/s
Velocity of block A after collision vA=(mA−mBmA+mB)uA+2mBuBmA+mB