(a) Questions from Skydiving Lab i. (From la and b. ) Show how to use the graph of the skydiver's height against time to estimate the velocity of the skydiver at t = 25 and t = 75. ii. (From 1d.) Show and explain how to use points from the graph to determine the values of a, m, and b in the piecewise function: at 2 if 0 30 iii. (From le.) Use the function s(t) and the difference quotient to compute an approximate value for v(25). Compare this approximation to what you found in part a. iv. (From c.) Sketch a graph (on well labeled axes) of the velocity of the skydiver over time. There should be a jump at t = 30. Explain why this happens