# Motion: Question Preview (ID: 23076)

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**A runner starts a 5 km race at 10:15 a.m. and finishes at 10:35 a.m. Given this information, you can calculate the runner's**

a) average speed.

b) velocity.

c) acceleration.

d) reference point.

**In can be important to know the velocity of an object, not just its speed, because**

a) velocity also tells direction.

b) speed is only useful for fast moving objects.

c) speed is always an average.

d) velocity also tells acceleration.

**The trunk of a certain tree is 50 cm thick. Each year it gets thicker by 1 cm. How thick will the trunk be in 50 years?**

a) 100 cm

b) 50 cm

c) 5000 cm

d) 2500 cm

**A rider finishes a 120 km bicycle trip in 3 hours. The average speed of the rider is**

a) 40 km/hr

b) 360 km/hr

c) 4 m/s^2

d) 3.6 m/s

**How many centimeters are in a kilometer?**

a) 100000

b) 1000000

c) 1000

d) 100

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

a) 1 m/s^2

b) 15 km/s^2

c) 15 m/s^2

d) cannot be calculated from the information given

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

a) 180000 m/h

b) 500 cm/s

c) 5000 m/hr

d) 1800 km/h

**Speed measurements are given in units of**

a) distance/time

b) distance/time^2

c) time^2/ distance

d) time/distance

**Measurements of acceleration are given in units of**

a) distance/time^2

b) distance/time

c) time^2/distance

d) time/distance

**An airplane flies 80 km in 10 minutes and then flies 100 km in 20 minutes. The average speed of the airplane is**

a) 360 km/h

b) 60 km/h

c) 8 km/h

d) none of the above

**An object is in motion if it is moving relative to a(n)**

a) reference point

b) moving object

c) direction

d) speed

**To calculate acceleration, divide the change in ___________ by the time during which the acceleration occurs.**

a) velocity

b) speed

c) direction

d) slope

**The velocity of an object gives both its speed and __________.**

a) direction

b) acceleration

c) time

d) movement

**You can calculate an average ________ if you know both the total distance and the total time of a trip.**

a) speed

b) velocity

c) acceleration

d) distance

**An object cannot be accelerating if it has a constant speed.**

a) True

b) False

c)

d)

**The information needed for describing velocity is distance/time and direction.**

a) True

b) False

c)

d)

**To determine the speed of an object, divide distance by acceleration.**

a) True

b) False

c)

d)

**An object is in motion only if its distance from a reference point is stationary.**

a) True

b) False

c)

d)

**If you know the speed of an object, you also know the direction of movement.**

a) True

b) False

c)

d)

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