Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going up with an acceleration
The lift is going up with uniform speed
The lift is going down with an acceleration
The lift is going down with uniform speed

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

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

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