| failed my midterm so badly. | got an f and | need a step-by-step explanation of these problems that | failed. 1. Starting from rest, a wagon with a mass of 60 kg is pulled until a velocity of 15 m/s is reached. The wagon is pulled for a time of 4 seconds. a. What is the acceleration of the wagon? b. What amount of force is required to pull the wagon? 2. Two forces act on an 8 kg cart. One force has a magnitude of 35 N and is directed north. The other force has a magnitude of 50 N and is directed west. a. What is the net force on the cart? (Include direction.) b. What is the acceleration of the cart? 3. A bulldozer drags a log weighing 500 N along a rough surface. The cable attached to the log makes an angle of 30 with the ground. The coefficient of static friction between the log and the ground is 0.5. What is the minimum amount of tension needed in the cable in order to move the log? 4. Asteel ball with a mass of 2.75 kg is whirled around in a circle of radius 0.5 meters. It experiences a centripetal force of 50 N. a. What is the centripetal acceleration of the steel ball? b.. What is the tangential velocity of the steel ball? 5. Matthew pulls his little sister Sarah in a sled on an icy surface with a force of 150 N at an angle of 25 upward from the horizontal. He pulls her a horizontal distance of 40 meters. a. How much work is done by Matthew in pulling Sarah? b. It takes 80 seconds for Matthew to pull Sarah in the sled. How much power is he expending? 6. A driver initially at rest accelerates her 2500 kg car to a final velocity of 25 m/s. a. What is the kinetic energy of the car at its final velocity? b. The force being applied to the car is 1500 N. How far does the car travel in this time? 7. A0.05 kg tennis ball initially at rest is struck by a racket causing it to take off with a velocity of 25 m/s. a. What is the change in momentum of the ball? GR ypes b. The ball is in contact with the racket for 0.005 seconds. What amount of force is applied to the ball? 8. A railroad freight car of mass 20,000 kg is allowed to coast along a level track at a speed of 12 m/s. It collides and sticks to another car of 40,000 kg initially at rest and with the brakes released. a. What is the momentum of the first car before the collision? b. What is the velocity of both cars after they collide