Hi, this is my first time using this forum, so i have no idea if this is even the correct place to be asking for help. I have a problem with my High School Higher Physics Homework. The question is as follow : 1. The problem statement, all variables and given/known data During one run, a car and passengers of mass 800kg are released from rest at point A, a height of 20m above the ground. The car travels a distance of 120m along the track until it reaches point C, a height of 15m above the ground. A constant frictional force of 250N acts between the car and the track as the car moves from A to C. (A diagram of the track is included, see attachments). Find the Kinetic Energy of the Car on reaching point C. 2. Relevant equations In the previous question i have been asked to calculate the work done against friction in moving from A to C, and i calculated this to be 30,000 N (W=fd W=120 * 250) (Not sure if this is correct though?) I think Ep=mgh is maybe relevent and obviously to work out the kinetic energy Ek=1/2mv^2 will be used. 3. The attempt at a solution I genuinlly have no idea where to start on this question ? I am thinking that it will maybe have something to do with Potential energy loss, and the energy lost due to friction but i am completly confuzed. Can anyone please help me ?