A hockey puck of mass 0.25 kg starts from rest and slides down the frictionless ramp sho...

A hockey puck of mass 0.25 kg starts from rest and slides down the frictionless ramp shown in Figure P6.41. The bottom end of the ramp is horizontal. After it leaves the ramp, the puck travels as a projectile and lands a distance L from the ramp. (a) Is the puck’s mechanical energy at the top of the ramp equal to its mechanical energy when it leaves the ramp and is in the air? Explain why or why not. (b) Add a coordinate system to the sketch in Figure P6.41. Where is a convenient place to put the origin of the vertical (y) axis? Do you have to put it there? (c) What is the initial mechanical energy of the puck? (d) What is the mechanical energy of the puck the instant it leaves the ramp? (e) What is the speed of the puck the instant it leaves the ramp? (f) How far from the base of the ramp does the puck land?