A sphere is released and falls. Its initial acceleration reduces until it eventually begins to travel at constant terminal velocity. Which displacement-time graph best represents the motion of the sphere?
A building has 5 floors. The windows on successive floors are separated by the same vertical distance.
A brick is dropped from a window on each floor at the same time.
The bricks should hit the ground at:
Answer
A decreasing time intervals
B equal time intervals
C increasing time intervals
D the same time
Question 3
Question
A girl dropped a stone into an empty well.
She heard the sound of the stone hitting the bottom of the well after 4 seconds.
The depth of the well is about
Answer
A 20 m
B 40 m
C 80 m
D 160 m
Question 4
Question
A marble is dropped from the roof of a building and takes 3.2 s to reach the ground.
The approximate height of the building is:
Answer
A 16 m
B 31 m
C 50 m
D 100 m
Question 5
Question
A ball is thrown vertically upwards with a velocity of +3.0 m.s^-1.
At the maximum height, the acceleration of the ball is -
Answer
A 0 m.s^-2
B – 3.0 m.s^-2
C + 9.8 m.s^-2
D – 9.8 m.s^-2
Question 6
Question
A ball is dropped from rest from a building 35.0 m high.
If air resistance is neglected the ball hits the ground with a speed of -
Answer
A 8.4 m.s^–1
B 13.1 m.s^–1
C 18.5 m.s^–1
D 26.2 m.s^–1
Question 7
Question
A bus is travelling at a speed of 9.0 m s–1. It then accelerates at a rate of 0.75 m s–2 for a time of 8.0 s.
What is its final speed?
Answer
A 6.0 m.s^–1
B 15 m.s^–1
C 17 m.s^–1
D 21 m.s^–1
Question 8
Question
The acceleration of free fall on a particular planet is 8.0 m.s^–2.
An object is dropped from a height and hits the surface of the planet after 1.5 s.
From what height was it dropped?
Answer
A 6.0 m
B 9.0 m
C 11.0 m
D 12.0 m
Question 9
Question
A cyclist travelling at a speed of 4.2 m.s^–1 accelerates at 1.1 m.s^–2.
In a time of 7.4 s the distance traveled is: