A giant toy car with big wheels has a total mass (including the wheels) of 0.21 kg. The car has 4 wheels and each wheel has radius of 3.3 m and a moment of inertia of 0.22 kg m2. The car is attached to a horizontal spring. The spring is inititally unstretched and the car is given an initial speed of 1.9 m/s away from the spring. The car moves forward 0.38 m before it stops and is pulled back by the spring. The wheels roll without slipping the entire time. What is the spring constant?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.