A bus of 2500 kg is moving on a straight...

A bus of 2500 kg is moving on a straight road with a speed of 40 km/h. A car of 1500 kg is following the bus with a speed of 80 km/h. How fast is the centre of mass of the system of two vehicles moving?

55 km/h

72 km/h

68 km/h

70 km/h

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Verified by Experts

The correct Answer is:

`v_(cm)=(m_(1)v_(1)+m_(2)v_(2))/(m_(1)+m_(2))=(2500xx40+1500xx80)/(2500+1500)`
`v_(cm)=(100000+120000)/(4000)=(220)/(4)=55km//h`

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