Physics
Rocket works on the principle of

Archimedes Principle
Newton's First Law
Newton's Third Law
Newton's Second Law

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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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