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In this lesson, we will learn how to apply Newton's third law of motion to calculate the forces acting on pairs of mutually attracting or repelling objects.

Q1:

A 1 1 0 0 . 0 -kg artillery shell is fired from a battleship, and the shell is accelerated at 2 . 4 0 × 1 0 4 m/s^{2}?

What is the magnitude of the net external force exerted on the shell?

What is the magnitude of the force exerted on the ship by the shell’s acceleration?

Q2:

A sports car of mass 550 kg collides with a truck of mass 2 2 0 0 kg, and, during the collision, the net force on each vehicle is the force exerted by the other. The magnitude of the truck’s acceleration is 10 m/s^{2}. What is the magnitude of the sports car’s acceleration?

Q3:

When starting a race, a 55.0-kg-mass sprinter exerts an average force of 635 N backward on the ground for 0.560 s.

What is the sprinter’s speed after the acceleration?

How far does the sprinter move during the acceleration?

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