7.41 . A 350 kg roller coaster car starts from rest at point A and slides down a frictionless loop-the-loop (Fig. P7.41). The car's wheels are de- signed to stay on the track. (a) How fast is this roller coaster car moving at point B? (b) How hard does it press against the track at point B? Figure P7.41

7.41 . A 350 kg roller coaster car starts from rest at point A and slides down a frictionless loop-the-loop (Fig. P7.41). The car's wheels are de- signed to stay on the track. (a) How fast is this roller coaster car moving at point B? (b) How hard does it press against the track at point B? Figure P7.41