Discussion
Which one of the following is a scalar quantity?
Answer: A
The scalar quantity is mass.
A scalar has magnitude only, while a vector has both magnitude and direction. Mass, the amount of matter in a body, is a scalar measured in kilograms.
Weight is the force of gravity on a body and acts towards the centre of the earth, so it is a vector. Momentum, mass times velocity, has the direction of the velocity. Gravity, as a force or as the acceleration due to gravity, also has direction.
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