Question
The diagram shows a speed–time graph for a moving object.
Which statement describes the motion of the object?
- The speed of the object is increasing with constant acceleration.
- The speed of the object is increasing with an acceleration that is not constant.
- The speed of the object is decreasing with constant deceleration.
- The speed of the object is decreasing with a deceleration that is not constant.
Answer/Explanation
Ans:A
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:
Question
The graph shows how the speed of an object changes with time.
How far does the object travel in 10 seconds?
A $8 \mathrm{~m}$
B $10 \mathrm{~m}$
C $40 \mathrm{~m}$
D $80 \mathrm{~m}$
Answer/Explanation
Ans:C
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
The diagrams are distance-time graphs for four bodies.
Which body is moving with an increasing speed?
Answer/Explanation
Ans:D