1.    The following experiment is used for measuring the instantaneous speed of a trolley as it travels down a runway.

Use the equation above to find the missing values in the following table:

2. A car of length 3•5 m passes a student. The student records a time of 2•4 s between the front and the back of the car passing her.
Calculate the instantaneous speed of the car.
3. A train of length 150 m takes 1•42 s to enter a tunnel.
Calculate the instantaneous speed of the train.

4. The following experiment is set up to investigate the change in speed as a trolley rolls down a ramp.

(a) Calculate the speed of the trolley as it passes through the top light gate.
(b) Calculate the speed of the trolley as it passes through the bottom light gate.
(c) Calculate the average speed of the trolley on the ramp.