[the friction between sand...] It is more difficult to walk on a sandy road than on a concrete road because

For Competitive Exams

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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