Object P moves at a constant speed of repeatedly backwards and forwards in a straight line.
Object Q moves at a constant speed of vertically downwards.
Object R moves at a constant speed of in a circle.
Which objects are moving with uniform velocity?
P only
Q only
R only
Q and R
A stone is dropped from a tall tower and falls a distance of 50 m to the ground.
The stone has a mass of 3.0 kg .
At which speed does the stone hit the ground?
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.