A car driver travelling at constant speed in a straight line sees a hazard in the road ahead at time = 0. The speed-time graph shows how the speed of the car changes from time = 0. [Figure 4.1 - speed-time graph with areas X and Y] Three students suggest what area X and area Y represent. student 1 Area X represents the thinking distance. student 2 Area Y represents the stopping distance. student 3 Area X + area Y represents the stopping distance. Which students are correct?

A student drops, from rest, a table-tennis ball in air. What happens to the velocity and to the acceleration of the b…

A cyclist takes a ride lasting 25 s. The diagram shows how her distance travelled from the starting position varies w…

A car begins to move. It speeds up until it reaches a constant speed. It continues to travel at this constant speed f…

In a short-sighted eye, light from distant objects is not focused on the retina. Where is this light focused and what…

Below are four statements about the uses of electromagnetic radiation. Gamma rays are used in medical treatment. Infr…

Two straight electrical conductors are parallel to one another. Each carries a current, one into the plane of the pap…