Physics
If the velocity of a body is halved its kinetic energy ________

Is also doubled
Becomes 1/4 th
Becomes half
Become 4 times

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

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
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

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