The diagram shows an aeroplane of mass 3.4 x 10⁵ kg accelerating uniformly from rest along a runway.

After 26 s it reaches a speed of 65 m/s.

a. Calculate

i. The acceleration of the aeroplane

ii. The resultant force on the aeroplane.

b Just after taking off, the aeroplane continues to accelerate as it gains height.

i. State two forms of energy that increase during this time.

ii. State one form of energy that decreases during this time.

iii. State why the total energy of the aeroplane decreases during this time.

c. When the aeroplane reaches its maximum height, it starts to follow a curved path at a constant speed.

State the direction of the resultant force on the aeroplane.