Unit II – Worksheet # 3 First Attempt 1. Mr. Todd jogs eight times around a 400 meter long track in 12.5 minutes. (a) Determine Mr. Todd’s average speed. (b) Determine Mr. Todd’s average velocity. 2. To qualify for a race, a car must average 350 km/hr for four laps. If a driver averages 285 km/hr for the first two laps, what average speed must be achieved for the final two laps in order to qualify? Name ________________________ Corrections/Solutions Unit II – Worksheet # 3 First Attempt For problems 3-7, show a motion map, a position vs. time graph, and a velocity vs. time graph for each, then answer the question. 3. A Labrador Retriever runs 50.0 meters in 7.20 seconds to retrieve a bird. The dog then runs half way back in 3.85 seconds. Determine the average speed and average velocity of the dog. 4. A jet travels 2250 km westward at a speed of 960 km/hr. It then encounters a strong headwind and its speed drops to 805 km/hr for the next 1320 km of its westward trip. What is the average velocity for the trip? Corrections/Solutions Unit II – Worksheet # 3 First Attempt 5. Two Metra trains are on separate but parallel tracks. One has a speed of 90 km/hr, the other 80 km/hr. Initially, the two trains are 2.71 km apart. How long will it take the two trains to pass each other? 6. A Ford is traveling with a speed of 15 m/s and is 200 meters ahead of a Chevy traveling in the same direction at 20 m/s. How far will the Chevy travel before catching up to the Ford? Corrections/Solutions Unit II – Worksheet # 3 First Attempt 7. A hungry bat finds the mother lode of flying insects between the headlights of two bicycles cruising towards each other through the Herrick Lake Forest Preserve. The bikes are 100 meters apart at the start and one has a speed of 8.0 m/s and the other a speed of 10.0 m/s. The bat has a speed of 20.0 m/s. Assume that the bat flies from the front tire of one bike straight to the front tire of the other bike, then turns around with no delay and heads towards the other bike. This is repeated until both bikes and the bat are at the same place. Determine how far the bat flies during this flying feast. Corrections/Solutions