Physics
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.

0.044444444444444
Cannot be found from the given information.
0.043055555555556
0.042361111111111

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Physics
For an ideal gas, which one of the following statements does not hold true?

The potential energy of the gas molecules is zero
The speed of all gas molecules is same
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.

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