A Worker Pulls Horizontally on a Rope That Is Attached

question 8

Multiple Choice

A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor.The coefficients of static and kinetic friction are 0.5 and 0.3,respectively.The worker pulls with a force of 40 N.The frictional force exerted by the surface is

• A)30 N
• B)50 N
• C)10 N
• D)100 N
• E)40 N

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