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Question

A jet plane moves up in air because:
  1. The thrust of the jet compensates for the force of gravity
  2. The flow of air around the wings causes an upward force, which compensates for the force of gravity
  3. The weight of air whose volume is equal to the volume of the plane is more than the weight of the plane
  4. The gravity does not act on bodies moving with high speeds


Solution

The correct option is A The thrust of the jet compensates for the force of gravity
When jet plane flies, it ejects gases in back ward direction at very high velocity. From Newton's third law, these gases provides the momentum to jet plane in forward direction plus compensates the force of gravity.

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