Which of the following is correct, when a person walks on a rough surface? Physics - Questions and Answers

Which of the following is correct, when a person walks on a rough surface?

(a)The frictional force exerted by the surface keeps him moving

(b)The force which the man exert on the floor keeps him moving

(c)The reaction of the force which the man exerts on floor keeps him moving Right sign

(d)None of the above

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