Physics
A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls

In front of him
Behind him
By his side
Into his hand

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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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