# 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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