Question

ntchoose the correct optionn nt(1) when a person walks on a rough surface, the frictional force is involved is kinetic frictionn nt(2)when a person walks on a rough surface , the frictional force exerted by the surface on the person is opposite to the direction of his motionn nt(3)when a person walks on a rough surface , the frictional force exerted by the surface on the person is in the direction of his motionn ntnt(4))when a person walks on a rough surface , no frictional force exerted by the surface on the personn

Answer 1