Which of the following is a unit of velocity?

Lightyear

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Mach

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Parsec

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Knots

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Solution

The correct options are
B Mach
D Knots
Mach is a unit used to measure velocities of aircrafts. A knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph. It is used to measure the speed of ships.

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