Question

Which of the following statements is true (MAQ) more than one answer
a) co - efficient of friction may be greater than unity
b) co-efficient of rolling friction is lessthan that of kinetic friction
c) the frictional force is independent of the speed of the body
d) the frictional force is inversly proportional to the normal reaction​

Answer 1

Answer:

the ans. are b,c as because friction doesnot depends upon the spped and coeff. of friction can never be greater than 1