First slide

Motion of centre of mass

Question

Two blocks A and B are connected by a massless string. A force of 30 N is applied on block B. The distance travelled by the centre of mass in 2 sec starting from rest is

Moderate

Solution

$a_{c} = \frac{30}{10 + 20} m / s^{2} = 1 m / s^{2} ∴ x_{c} = \frac{1}{2} . 1 . {(2)}^{2} m = 2 m .$

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