Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

The question is incomplete because the masses of the spheres are not given.
A will reach the ground first.
B will reach the ground first.
Both the spheres will reach the ground simultaneously.

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The sea is wider than the river

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