On Fig. 2.1, draw the car just after it has fully left the ramp, label the distance $l$, and label the height $h$.
The student measures the height $h$ and then records the distance $l$ three times. He then alters the height of the ramp and repeats the investigation. Describe how the student can measure $h$ accurately. You may add labels to the diagram if you want.
For the first three heights, the student works out the average distance $l_{av}$. $l_{av}$ is given to the nearest cm. Suggest a reason for giving $l_{av}$ to the nearest cm.
Complete Fig. 2.2 by adding $l_{av}$ for every result. Give $l_{av}$ to the nearest cm in each case.
On Fig. 2.3 opposite, plot the graph of $l_{av}$/cm on the y-axis against $h$/cm on the x-axis. Start both axes from $(0,0)$. Draw the line of best fit.
Describe the relationship between $l_{av}$ and $h$.
In a different experiment using the same apparatus, $l_{av}$ is found to be $140\,\text{cm}$. Use your graph to suggest the value of $h$ that was used.