A car travelling at 60 km per hour passes a truck going at 30 km per hour that has four times the mass of the car.

Which of the following is true?

1) The car and the truck have the same momentum and the same kinetic energy.

2) The truck has greater kinetic energy than the car.

3) The car has the same kinetic energy and half as much momentum as the truck.

A hollow plastic ball and a solid metal ball all of the same external radius are both released from rest in a vacuum chamber.

After falling for one minute, they will have the same:

A body falling in air experiences terminal velocity when its:

The acceleration due to gravity on earth is 10 ms⁻² while on the moon it is 1.6 ms⁻².

If a person whose weight on earth is 500 N goes to the moon.

His weight on the moon will be:

The air resistance experienced by a moving car can be reduced by: