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

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.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

you can cut your hand off if your not