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A man of mass 80 kg is riding on a small...

A man of mass 80 kg is riding on a small cart of mass 40 kg which is rolling along a level floor at a speed 2 m/s . He is running on the cart , so that his velocity relative to the cart is 3 m/s in the direction opposite to the motion of cart . What is the speed of the centre of the mass of the system ?

A

1.5 m/s

B

1 m/s

C

3 m/s

D

Zero

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