Question 1

A car's speedometer measures which of the following quantities?

Accepted Answer

Only the car's speed, which is the magnitude of velocity

Question 2

If an object moves with constant velocity, how does its average velocity over any time interval compare to its instantaneous velocity at any instant?

Accepted Answer

Average velocity equals instantaneous velocity at all times

Question 3

A motorcycle accelerates from $$80\ \mathrm{km/h} to$$ $$90\ \mathrm{km/h} in$$ $$5.0\ \mathrm{s}$$, while a bicycle accelerates from rest to $$10\ \mathrm{km/h} in $$the same time. Which has the greater acceleration?

Accepted Answer

The motorcycle, because its change in speed ($$10\ \mathrm{km/h}) is $$the same as the bicycle, but over a higher initial speed

Question 4

A runner completes a lap around a $$400\ \mathrm{m}$$ track in $$14.5\ \mathrm{min}. $$What is the runner's average speed in $$\mathrm{m/s}$$?

Accepted Answer

$$0.92\ \mathrm{m/s}$$

Question 5

If a bird can fly $$25\ \mathrm{km/h}$$, how long does it take to fly $$3.5\ \mathrm{km}$$?

Accepted Answer

$$0.14\ \mathrm{h}$$

Question 6

A sprinter accelerates from rest to $$9.00\ \mathrm{m/s} in$$ $$1.38\ \mathrm{s}. $$What is her acceleration in $$\mathrm{m/s^2$}$$?

Accepted Answer

$$6.52\ \mathrm{m/s^2$}$$

Question 7

A car travels at $$95\ \mathrm{km/h}$$ for $$2.0\ \mathrm{s}$$ along a straight road. How far does it travel during this time?

Accepted Answer

$$52.8\ \mathrm{m}$$

Question 8

A sports car accelerates from rest to $$9.50\ \mathrm{m/s} in$$ $$4.3\ \mathrm{s}. $$What is its average acceleration in $$\mathrm{m/s^2$}$$?

Accepted Answer

$$2.21\ \mathrm{m/s^2$}$$

Question 9

A truck traveling at $$95\ \mathrm{km/h} is$$ $$210\ \mathrm{m}$$ behind a car traveling at $$75\ \mathrm{km/h}. $$How long will it take for the truck to catch up to the car?

Accepted Answer

$$37.8\ \mathrm{s}$$

Question 10

Two trains are traveling toward each other on parallel tracks. Train A travels at $$155\ \mathrm{km/h}$$ and Train B at $$125\ \mathrm{km/h}$$ with respect to the ground. If they are initially $$8.5\ \mathrm{km}$$ apart, how long will it be before they reach each other?

Accepted Answer

$$0.031\ \mathrm{h}$$

Question 11

An airplane travels $$2100\ \mathrm{km} at a $$speed of $$770\ \mathrm{km/h}$$, then encounters a tailwind that boosts its speed to $$990\ \mathrm{km/h}$$ for the next $$2500\ \mathrm{km}. $$What is the total time for the trip?

Accepted Answer

$$4.55\ \mathrm{h}$$

Question 12

Can an object have a northward velocity and a southward acceleration at the same time? Explain.

Accepted Answer

Yes, if the object is slowing down while moving northward

Question 13

Which of the following statements about average speed and average velocity is correct?

Accepted Answer

Average speed is always greater than or equal to the magnitude of average velocity

Question 14

A car travels $$235\ \mathrm{km} in$$ $$2.75\ \mathrm{h}. $$What is its average speed?

Accepted Answer

$$85.5\ \mathrm{km/h}$$

Question 15

Which of the following best describes instantaneous velocity?

Accepted Answer

The velocity at a specific instant, found as the slope of the tangent to the position-time graph

Question 16

A person jogs eight complete laps around a $$400\ \mathrm{m}$$ track in a total time of $$14.5\ \mathrm{min}. $$What is the average velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 17

If one object has a greater speed than a second object, does the first necessarily have a greater acceleration? Explain.

Accepted Answer

No, because acceleration depends on the rate of change of velocity, not its magnitude

Question 18

A motorcycle accelerates from $$80\ \mathrm{km/h} to$$ $$90\ \mathrm{km/h} in$$ $$5.0\ \mathrm{s}. $$What is its acceleration in $$\mathrm{m/s^2$}$$?

Accepted Answer

$$0.56\ \mathrm{m/s^2$}$$

Kinematics: Speed, Velocity, and Acceleration Study Notes

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