Can you help me with 3,4

3. A 12 kg object is pushed with a force of 6.0 N east across a floor, the force of friction between the two surfaces is 2.0 N. What is the acceleration of the 12 kg object? 0.67 m/s2, east 0.50 m/s-, east 0.33 m/s-, east 0.17 m/s-, east 4. A car has a mass of 1200 kg and accelerates from 0 to 100 km/h in 6.00 s. What is the force applied by the engine? 5.56 x 103 N 3.33 x 104 N 2.00 x 104 N 1.20 x 105 N