1. A box of mass 41 kg is pulled by a horizontal force of magnitude 54.2 N along a frictionless horizontal surface. If the box started with a speed of 3.1 m/s , how fast is it going after it moves 1.7 m ? 2. A 670 car can accelerate from rest to 10.7 m/s in 7.9 s . Find the average power output of the car. 3. A roller coaster cart moving along a frictionless track has a speed 12.1 m/s at point A, which has a height of 6.5 m . How fast will it be moving at point b Is point b's height is 0. 4. A roller coaster cart moving along a frictionless track has a speed 10.9 m/s at point A, which has a height of 12.6 m. How fast will it be moving at point c if point c has a height of 6m