Question

Two bodies of masses 2 kg and 4 kg are moving with velocities 2 m/s
and 10 m/s respectively along same direction. Then the velocity of their
centre of mass will be
(a) 8.1 m/s (b) 7.3 m/s
(c) 6.4 m/s (d) 5.3 m/s

Answer 1

Answer:

Taking direction of 4kgQs+Ve,

V

CM

=

m

1

+m

2

(m

1

×v

1

)+(m

2

×v

2

)

=

2+4

2×(−2)+4×10

⇒

6

−4+40

=

6

36

=6m/s

6m/s in direction of 4kg block.