The graph in Figure P1.31 represents four different motions. (a) Write a function x(t)...

The graph in Figure P1.31 represents four different motions. (a) Write a function x(t) for each motion. (b) Use the information in the graph to determine as many quantities related to the motion of these objects as possible. (c) Act out these motions with two friends. (Hint: think of what each object was doing at t = 0.)