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Showing posts with label It is more difficult to walk on a sandy road than on a concrete road because PAGE 465. Show all posts
Showing posts with label It is more difficult to walk on a sandy road than on a concrete road because PAGE 465. Show all posts

Sunday, 20 December 2015

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

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

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