Is it true that the earth moves round the sun with uniform velocity[90][91]?

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True

False

answer is B.

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Detailed Solution

The above statement is False.[92][93]
Velocity is a vector quantity, so when the earth moves in a circular motion, the direction will change; hence velocity will also change. So it can't remain uniform throughout the motion. The velocity of an object bound to move in a circle changes because velocity includes both speed and direction. The velocity is changing, but the speed is not.
The correct statement would be the earth moves around the sun with non-uniform velocity.

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