Two spheres of mass 2kg and 6kg are moving with velocities 4m/s and 8m/s away from each other along the same line. The ball of mass 2kg is moving towards left. The velocity of the center of mass is
A
4m/s
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B
7m/s
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C
5m/s
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D
3m/s
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Solution
The correct option is C5m/s Given, mass m1=2kg & m2=6kg Taking left to be negative direction. Velocity of masses, v1=−4m/s & v2=8m/s
Thus, we have velocity of center of mass Vcm=m1v1+m2v2m1+m2=2(−4)+6(8)2+6=408=5m/s