1. The speed of a train during the first minute has been recorded as follows:
t 1s2 0 20 40 60
v 1m>s2 0 16 21 24
Plot the -t graph, approximating the curve as straight-line segments between the given points. Determine the total distance traveled.
2. A man riding upward in a freight elevator accidentally drops a package off the elevator when it is 100 ft from the ground. If the elevator maintains a constant upward speed of 4 ft> s, determine how high the elevator is from the ground the instant the package hits the ground. Draw the -t curve for the package during the time it is in motion. Assume that the package was released with the same upward speed as the elevator.
3. Two cars start from rest side by side and travel along a straight road. Car Aaccelerates at 4 m>s2 for 10 s and then maintains a constant speed. Car B accelerates at 5 m>s 2 until reaching a constant speed of 25 m> s and then