Help with 6-10

Unit 2: 6. You are driving at 53km/h when a child runs out into the street. You slam on your brakes and screech to a halt just short of the child, all of this takes only 1.2 seconds. If the mass of your car is 1300kg, what is the co-efficient of friction between your tires and the road? 1.25 7. A large stone (m=250kg) is being pulled by two trucks. One truck pulls with a force of 800N due north, the other pulls with a force of 100N at 30 E of N. What is the acceleration of the stone? 3.5m/s @ 3.2. E of N 8. A 15.0kg box is being pulled up a ramp by a force of 100N. The ramp is angled at 25.0 and has a co-efficient of friction of . 190. What is the acceleration of the box? .838m/s' up the ramp. 9. In a situation where a mass of 3.5kg is sitting on a level surface and connected over a pulley to a hanging 2.5kg mass, calculate the acceleration of the 2.5kg mass if the co- efficient of friction of the level surface is .245. 2.7m/s' down 10. Two ice skaters push away from each other on the ice. One skater has a mass of 60kg and the other has a mass of 42kg. If the 60kg skater has an acceleration of 1.3m/s, what is the acceleration of the second skater? -1.9m/s