Physics 5054/22 — May/June 2020

During the race, the acceleration of the athlete is uniform in the first $2.0\ \text{s}$.

State how the graph shows that the acceleration is uniform.

Determine the distance travelled by the athlete in the first $2.0\ \text{s}$.

distance = ______

During the rest of the race:

• from $2.0\ \text{s}$ to $5.5\ \text{s}$, the acceleration of the athlete decreases
• at $5.5\ \text{s}$, the athlete reaches a maximum speed of $12\ \text{m / s}$
• from $5.5\ \text{s}$ to $8.0\ \text{s}$, the athlete travels at a speed of $12\ \text{m / s}$
• from $8.0\ \text{s}$ to $11.0\ \text{s}$, the athlete decelerates, finishing the race at a speed of $10\ \text{m / s}$.

On Fig. 1.1, complete the speed–time graph for times between $2.0$ and $11.0\ \text{s}$.