A tennis ball of mass 55g is travelling horizontally with a speed of 30ms⁻¹. The ball makes contact with a wall before rebounding in the horizontal direction with a speed of 20 ms⁻¹. The ball is in contact with the wall for a time of 5.0 × 10⁻³s. What is the average force exerted on the wall by the ball?

A car accelerates in a straight line. A graph of the momentum of the car is plotted against time. What is evaluated b…

Which row correctly states whether momentum and kinetic energy are conserved in an inelastic collision in which there…

A strong wind of speed 33ms⁻¹ blows against a wall. The density of the air is 1.2kg m⁻³. The wall has an area of 12m²…

In which situation does diffraction occur?

What describes the electric potential difference between two points in a wire that carries a current?

A cylindrical piece of a soft, electrically-conducting material has resistance R. It is rolled out so that its length…