Calculating from velocity-time graphs (a=(v-u)/t) | Starter Quiz | Oak National Academy

Five yachts have a sailing race around the same course. Their completion times are shown. Starting with the fastest, put them in order of average speed.

• 1 hour 28 minutes

• 1 hour 19 minutes

• 1 hour 49 minutes

• 1 hour 20 minutes

• 1 hour 15 minutes

Answer explanation

The speed is found using speed = distance ÷ time, and so the lowest speed will be the yacht with the greatest time and the fastest will be the one with smallest time.

Which word is used to describe an object which has a decreasing velocity?

Answer explanation

The word deceleration is used to describe an object slowing down.

An electric scooter has a maximum speed of 2.5 m/s. Calculate the maximum distance it can travel in 50 s.

• 2.5 m

• 20 m

• 47.5 m

• 52.5 m

• 125 m

Answer explanation

distance = speed × time = 2.5 m/s × 50 s = 125 m.

A satellite travels a distance of 10 800 km in 1 hour. What is the speed of the satellite in km/s?

• 0.33 km/s

• 3.0 m/s

• 3.0 km/s

• 180 km/s

• 10 800 km/s

Answer explanation

speed = 10 800 km ÷ (60 × 60 s) = 3.0 km/s

Which of these is the correct unit for acceleration?

• m

• m/s

• ms

A train speeds up from 2.0 m/s to 8.0 m/s in a time of 50 s. Calculate the acceleration of the train.