# Physics

A small car (mass 380 ) is pushing a large truck (mass 1000 ) due east on a level road. The car exerts a horizontal force of 1580 on the truck. What is the magnitude of the force that the truck exerts on the car?

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1. Remember Newton's third law of motion. The reactionary force on the car would be of the same magnitude i.e. 1580N.

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2. Magnitude = 1580 N from 3rd Law of Motion

but F itself = -1580 N (opposite direction)

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