A Block of Wood Is Pulled by a Horizontal String

question 14

Multiple Choice

A block of wood is pulled by a horizontal string across a rough surface at a constant velocity with a force of 20 N.The coefficient of kinetic friction between the surfaces is 0.3.The force of friction is

• A)impossible to determine without knowing the mass of the block.
• B)impossible to determine without knowing the speed of the block.
• C)0.3 N
• D)6 N
• E)20 N

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