Question

A jet plane flies in air because

• A. The thrust of the jet compensates the force of gravity.
• B. The weight of air whose volume is equal to the volume of the plane is more than the weight of the plane.
• C. The flow of air and the wings causes an upward force which compensates for the force of gravity.
• D. The gravity does not act on body moving with high speed.

Answer 1

The correct option is A The thrust of the jet compensates the force of gravity.

Initially , when the plane is taking off, thrust force is more than the force of gravity. When it is in the air, the force of gravity is compensated by the thrustof the jet.

And when the plane lands, at that point of time , the thrust force is less than the force of gravity.