A bus of mass 2400 kg is moving on a straight road with a speed of 30 km/h. A car of mass 1600 kg is following the bus with speed of 40 km/h. How fast is the centre of mass of the system of two vehicles moving?

A bus of mass 2400 kg is moving on a straight road with a speed of 30

1.	A bus of mass 2400 kg is moving on a straight road with a speed of 30 km/h. A car of mass 1600 kg is following the bus with speed of 40 km/h. How fast is the centre of mass of the system of two vehicles moving?
Answer» `70km//h` `75km//h` `34km//h` `68km//h` SOLUTION :`v_(cm)=(m_(1)v_(1)+m_(1)v_(2))/(m_(1)+m_(2))` `=(2400xx30+1600xx40)/(2400+1600)` `=(72000+64000)/(4000)` `=(136000)/(4000)` `=34km//h`