1. A small hockey puck slides without friction over the icy hill shown in the figure and lands 6.2m from the foot of the cliff with no air resistance. What was the speed v0 at the bottom of the hill? There is also a diagram showing the hill. The puck starts at the bottom and travels 15.3m to the top. The cliff then drops off vertically straight down 8.5m. The puck lands 6.2m from where it went airborn off the cliff. 2. I think this is a PE KE question. 3. PE is zero initially which means the total energy is KE there. KE=1/2mv^2 so if we can find the total energy initially we can solve for v. BUT, we have no mass for that equations. So i tried setting up something like KEi+PEi=KEf+PEf since no energy is lost from friction or any other external force. I'm not sure where to go from there. PE is also going to be 0 after it falls of the cliff as well. PE just before it falls is at a max which is mgh, but still we have no mass given.