Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

Both suffer the same change in momentum
The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball

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

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

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