Figure P1.21 shows a velocity-versus-time graph for the bicycle trips of two friends wi...

Figure P1.21 shows a velocity-versus-time graph for the bicycle trips of two friends with respect to the parking lot where they started. (a) Determine their displacements in 20 s. (b) If Xena’s position at time zero is 0 and Gabriele’s position is 60 m, what time interval is needed for Xena to catch Gabriele? (c) Use the information from (b) to write function x(t) for Gabriele with respect to Xena.