a brick has mass of 1.2 kg. a force of 5.4 N is needed to move the brick along the floor with a constant velocity. what is the coefficiant of friction?

Answer 1

constant velocity means no net accelerating force, which means the pushing force of 5.4N is equal to the opposing force, friction.

Frictionforce=mu*mg
solve for mu.

Answer 2

A car moves at 12 m/s and coast up a hill with a uniform acceleration of -1.6 m/s^2..What is its displacment after 6 sec.? What is its displacment after 9 sec.?