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  4. Two particles are at rest as shown. Suddenly a force F =6 N starts acting on the 3 kg particle. Find the velocity of the centre of mass of these particles at t =5 sec

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Q. Two particles are at rest as shown. Suddenly a force $F =6 \,N$ starts acting on the $3 \,kg$ particle. Find the velocity of the centre of mass of these particles at $t =5\, \sec$Physics Question Image

Solution:

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$a=\frac{6}{3}=2\, m / s ^{2}$
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$=0+2 \times 5$
$=10\, m / s$
$V _{ cm }=\frac{2 \times 0+3 \times 10}{2+3}$
$ \Rightarrow 6\, m / s$