Question

A body of 10kg is acted by a force of 130N. The acceleration of the block is 10 m/s2. What is co-efficient of kinetic friction?

Answer 1

When Force of 130N is applied the kinetic friction acts in opposite side of the applied force.

So object will experience the resultant force of these.

So resultant force is mass times acceleration=10x10=100.

130 - kinetic friction=100
=>kinetic friction=30N

Answer 2

friction=130-100=30........