1. A person is sliding a 15.0 kg block across ice that has a coefficient of kinetic friction of 0.500. How much force does the person need to apply to keep the block moving at a constant rate

2. A 1.25 x 10^3 kg car is travelling at 16.0 m/s with an air resistance force of 2.50 x 10^2 when it's brakes are applied to produce an additional force to slow the car. What magnitude of force is applied by the brakes if it slows the car from 16.0 m/s to 10.0 m/s in 2.0s

3. Two toy wagons are tied together by ropes. Rope B is being pulled with a force of 25N. The mass of wagon 1 is 4.3kg and the mass of wagon 2 is 5.5kg (assume the force of friction is negligible.) Calculate the tension in rope A.

4. an electric motor is used to pull a 125kg box across a floor using a long cable. The tension in the cable is 350 N and the box accelerates at 1.2 m/s^2 [forwards] for 5.0s. Friction is present. The cable breaks (at t= 5.0s) and the box slowly comes to rest.

a) Calculate the coefficient of kinetic friction

b) How far does the box travel before coming to rest?