Chapter 9 9.1 and 9.2 questions 11 and 13

How many centimeters are in a kilometer

100,000

The trunk of a certain tree is 50 centimeters thick. Each year it gets thicker by 1 centimeter. How thick will the tree trunk being 50 years

100cm

An airplane that moves 50 meters in one second has a speed of

180,000m/h

A car travels at 25m/s speeds up to 40m/s over a period of 15 seconds. The average acceleration of the car is

1m/s squared

An airplane flies 80 kilometers in 10 minutes and then flies 100 kilometers in 20 minutes the average speed of airplane is

360km/h

The rider finishes 120 kilometer bicycle trip in 3 hours. The average speed of their ride is

40km/h

A runner start say five kilometer race at 10:15 a.m. and finishes at 10:35 a.m. given this information you can calculate the runners

average speed

It can be important to know the velocity of an object not just its speed because velocity also tells

direction

The velocity of an object give both speed and

direction

Speed measurements are given in units of

distance/time

Measurements of acceleration are given in units of

distance/time squared

An object is in motion if it is moving relative to a

reference point