Unit II – Worksheet # 3

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