4. You are planning a bicycle trip for which you want to average 24 km/h. You cover the first half of the trip at an average speed of 21 km/h. What must your average speed be in the second half of the trip to meet your goal? 5. You have 6.0 hours to travel a distance of 140 km by bicycle. a. How long will it take you to travel the first half at an average speed of 21 km/h? b. In the second half ofthe ride, you need to increase your average speed to make up for lost time. Ifyou can maintain an average speed of 25 km/h, will you be able to reach your destination on time? a. Show your calculations for the average speed you need to maintain in the second half of the bike ride to make up for lost time. d. Draw a position-time graph for the bicycle trip. Show your position at 20-minute intervals. Chapter 2 ' Representing Motion 4 Copyright 0 GlcncociMchw-Hill. a division ofThc Mchw-Hill Companies. Inc