A scale used to weigh fish consists of a spring hung from a support. The spring has an equilibrium length is 8.0 cm. When a 2.0 kg fish is suspended from the end of the spring, it stretches to a length of 9.2 cm. Now you put a different fish on the spring scale and the spring stretches to 11.9 cm. What is the approximate mass of this other fish?

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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.