What is the unit of friction force and what is the unit of coefficient of friction?单项选择题

题目图片
A

a. Friction force has no unit and the coefficient of friction is in Newton

B

b. Friction force is in Newton and the coefficient of friction is also in Newton

C

c. Friction force is in kg and the coefficient of friction is in metre

D

d. Friction force is in Newton and the coefficient of friction has no unit

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