Three identical blocks A, B and C, each of
mass 2kg are kept on a smooth horizontal
surface. Block A is given a horizontal velocity
10m/s towards B (as shown in figure), Block
B and C are attached with a spring, Find
change in velocity of center of mass of
system A+B+C if A collides with B elastically,
10m/s
A
B
120000
5 m/s
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