Frontside air. A skateboarder is practicing on the “half-pipe” shown in Figure P6.39, us...

Frontside air. A skateboarder is practicing on the “half-pipe” shown in Figure P6.39, using a special frictionless skateboard. (You can also ignore the kinetic energy of the skateboard’s wheels.) (a) If she starts from rest at the top of the half-pipe, what is her speed at the bottom? (b) If the skateboarder has mass m = 55 kg, what is her apparent weight at the bottom of the half-pipe? (c) What speed does she then have when she reaches the top edge on the other side of the half-pipe? (d) Now suppose she has a speed of 11 m/s at the bottom of the halfpipe. What is the highest point she can reach? Hint: This point may be above the edge of the half-pipe.