1. The problem statement, all variables and given/known data A skateboarder with total mass of 70kg starts from rest at the top of a ramp and accelerates down it. The ramp is 25m long and is at an angle of 20 degrees to the horizontal. The skateboarder has a velocity of 12.2m/s at the bottom of the ramp. Calculate i) the average acceleration of the skate boarder on the ramp. ii) the component of the skateboarders weight that is parallel to the ramp. iii) the force of riction acting on the skateborader on the ramp. The skateboarder then maintains a speed of 10.5m/s until he enters a circular ramp of radius 10m. What is the initail centripetal force on him? What is his maximum height achieved? 2. Relevant equations 3. The attempt at a solution I used v^2 = u^2 + 2as to get the acceleration I i found his weight 686N and used sin21=686/x, to find the paralel component. Then for friction i substituted the parelel component from his weight (i think this is wrong). For the second part, i used F=mv^2/r to find the centripetal force. Thn i used 1/2mv^2 = mgh to ind the height. Can someone do it and tell me if i used the correct formulas and please write the answers i want to compare them.