Calculate $t_{av}$, the mean value of $t$. Give your answer to 2 decimal places.
Suggest a reason why the value of $t_{av}$ is not stated to more than 2 decimal places.
Suggest a reason why the distance that the parachute falls is chosen to be as large as possible.
The length $l$ of one side of the parachute is $21.0\,\text{cm}$. Calculate the area $A$ of the paper used to make the parachute.
Suggest a reason why the student cannot make a parachute with an area greater than your answer to (a)(iv) when using the sheet of A4 paper.
On Fig. 2.2, write your values of $A$ and $t_{av}$ for $l = 21.0\,\text{cm}$.
On Fig. 2.2, complete the column for $A$.
On Fig. 2.3, plot the graph of $t_{av} \/ \text{s}$ on the $y$-axis against $A \/ \text{cm}^2$ on the $x$-axis. Start your axes from $(100, 0.7)$. Draw the straight line of best fit.
When extended, the line of best fit misses the origin $(0,0)$. Explain why.