1.1. An aeroplane takes two minutes to travel the short distance between airports on two islands.  

The graph shows how the speed of the aeroplane changes as it

• takes off

• flies across the sea

• lands on the other island

When it is flying across the sea, the aeroplane travels at a constant speed.

Use the graph to answer the following questions.

 (i) State the value of the constant speed.

(1) 

speed = ..................................... m/s

 (ii) Calculate the acceleration of the aeroplane at the start of the journey and give the unit.

(3)

 acceleration = ............................... unit ...................

 (iii) Calculate the total distance that the aeroplane travels.

(3) 

distance = ..................................... m

1.2. Each airport has a runway that is about 500 m long.

When it lands, the speed of the aeroplane is 40 m/s.

Explain why the airline should not use an aeroplane that has more mass and needs a higher speed for landing.