A 300-kg truck moving rightward with a speed of 5 km/hr collides head on with a 1000kg car moving leftward with a speed of 100 km/hr. The two vehicles stick together and move with the same velocity after the collision determine the post – collision speed of the car and truck

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Answer:The final velocity of the vehicles will be -75km per hour (leftwards).

Explanation:Let us call, mass and velocity of the truck , mass and velocity of the car, and the final velocity of the vehicles.

The law of conservation of momentum states that

solving for we get:

putting in numerical values

(

the negative sign indicates that the vehicles are moving in the leftward direction)or -75.8 km per hour.