A toy gun fires a 9.41 g projectile disc by using a compressed spring (k= 1720 N/m). The barrel of the gun is 13.1cm (this is measured after the spring). As soon as the projectile goes leaves the spring, it creates thermal energy due to friction. The frictional force is 0.130N. If you compress the spring 14.0mm, what is the speed of the projectile when it leaves the gun?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.