You and your best friend are riding in your car. You go from Denver to Colorado Springs to go to your favorite restaurant. The trip is 64.1 miles and takes you 1.5 hours. What is your average speed for the trip in miles/hour?

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.