Physics
Which law is also called law of inertia ?

All of above
Newton second law
Newton first law
Newton third law

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

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