Distance - Time Graphs

Choose the correct relationship between speed, time and distance

Answer explanation

Usain Bolt ran the 100 m sprint in 9.63 s in August 2012. How do we work out his average speed over the race?

What was Usain Bolt's average speed over the race?

100 m sprint in 9.63 s

• 10.4 m/s

• 0.96 km/hr

• 10.4 km/hr

• 0.96 m/s

This is a distance-time graph of Usain Bolt's sprint.

Choose the best description of his speed over the race.

• He maintained a speed of 10.4 m/s throughout the race

• He accelerated, then decelerated.

• He started at a steady speed and slowed as he got tired.

• He sped up, then maintained a steady speed.

How far had he ran before reaching his maximum speed?

• 10 m

• 30 m

• 70 m

• 90 m

Valentina is going for a bike ride.

The distance-time graph describes her full journey.

How long was she stationary for?

• 5 minutes

• 7.5 minutes

• 10 minutes

• 15 minutes

What was the total distance travelled during her journey?

• 0 km

• 25 km

• 50 km

• 75 km

What was her average speed in kilometres per hour between 17:15 and 17:45?

• 20 km/hr

• 0.67 km/hr

• 40 km/hr

• 66.7 km/hr

Can you show evidence that you did this homework?

• Yes

• No