What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

Q. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer. 
Ans. The work done by the force of gravity on the satellite is zero because the force of gravity acts at right angles to the direction of motion of the satellite. Therefore, no displacement is caused in the direction of applied force. The force of gravity only changes the direction of motion of the satellite.

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