Question
A tennis ball falls from the upstairs window of a house.
What can be said about the acceleration of the ball if air resistance is ignored?
- It depends on the density of the ball.
- It depends on the mass of the ball.
- It increases as the ball falls.
- It stays the same as the ball falls.
Answer/Explanation
Ans:
D
Question
A car joins a road at a speed of 14 m / s and accelerates at 4.0 m / s2 for 5.0 seconds.
What is the final speed of the car?
A 18 m / s B 20 m / s C 32 m / s D 34 m / s
Answer/Explanation
Ans:
D
Question
A light object is dropped from rest. It falls a large distance vertically through air.
How can the motion of the object be described?
A constant acceleration
B increasing acceleration
C decreasing acceleration and then moving at terminal velocity
D increasing acceleration and then moving at terminal velocity
Answer/Explanation
Ans:C
Question
A car travels at an average speed of $60 \mathrm{~km} / \mathrm{h}$ for 15 minutes.
How far does the car travel in 15 minutes?
A $4.0 \mathrm{~km}$
B $15 \mathrm{~km}$
C $240 \mathrm{~km}$
D $900 \mathrm{~km}$
Answer/Explanation
Ans:B
Question
A train begins a journey from a station and travels 60 km in a time of 20 minutes.
What is the average speed of the train?
A 3.0 m / s
B 5.0 m / s
C 50 m / s
D 60 m / s
Answer/Explanation
Ans: C