The graph given here shows the motion of a pedal on a child s bicycle as they ride down the driveway at their home Height cm 20 15 10 2 3 4 5 6 7 time s 9 10 11 12 13 14 15 What is the significance of the period of the curve a the distance covered during one full rotation of the pedal b the time needed for a full rotation of the pedal c the distance covered for the whole trip d the time needed for the whole trip A