Physics
The recoiling of gun is an example of which of the following?

Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Angular Momentum
Law of Conservation of Linear Momentum
Law of Conservation of Energy

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

the full weight of the barrel comes into play when it is pulled
more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction
coal tar is a liquid and it flows in the barrel when it is rolled

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