A 300-kg truck moving rightward with a speed of 5 km/hr collides head-on with a 100-kg car moving leftward with a speed of 10 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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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.
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