Momentum and Kinetic Energy Question?

A car traveling at 50 km/h collides with a stationary truck. The car has a mass of 800 kg and the truck has a mass of 1600 kg. After the collision the car and the truck stick together. a) What is the speed of the truck after the collision? The car and truck leave skid marks along the road (after the crash the... show more A car traveling at 50 km/h collides with a stationary truck. The car has a mass of 800 kg and the truck has a mass of 1600 kg.

After the collision the car and the truck stick together.

a) What is the speed of the truck after the collision?

The car and truck leave skid marks along the road (after the crash the wheels of the two vehicles lock up and do not turn) as they come to rest.

b) If these skid marks are 30 m long, what is the coefficient of kinetic friction between the wheels and the road?
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