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Identify the correct statement. In the a...

Identify the correct statement. In the absence of external force,
(a) the kinetic energy associated with the motion of centre of mass is conserved
(b) centre of mass is not accelerated
(c ) the centre of mass always move in curved line
(d) centre of mass must be at rest

A

a & b are correct

B

all are true

C

all are false

D

a & c are correct

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