The velocity of an aeroplane is made twice (a) What will happen to the momentum? Will the momentum remain conserved? (b) What will happen to the K.E.? Will the energy remain conserved ?

Explanation

When velocity of aeroplane is made twice, its momentum will becom twice.
The momentum of plane and that of air will remain conserved. This is because when momentum of plane becomes twice, the momentum of air in the opposite direction will also become twice.
(b) K.E. of the plane will become four times. The additional energy will be obtained from the burning of the fuel of the plane. Total energy shall remain conserved.