Question

define mass and velocity​

Answer 1

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A measure of how much matter is in an object. ... Mass is commonly measured by how much something weighs. But weight is caused by gravity, so your weight on the Moon is less than here on Earth, while the mass stays the same. Mass is measured in grams, kilograms and, tonnes (Metric) or ounces and pounds (US units).

Velocity is defined as the rate change of displacement per unit time. Speed in a specific direction is also known as velocity. Velocity is equal to displacement divided by time

$\textit{Hope this helps you}$

Answer 2

Mass :

Mass is a measure of the amount of matter in an object. Mass is usually measured in grams (g) or kilograms (kg).

Mass measures the quantity of matter regardless of both its location in the universe and the gravitational force applied to it. An object's mass is constant in all circumstances; contrast this with its weight, a force that depends on gravity.

Your mass on the earth and the moon are identical. Your weight on the moon is about one-sixth of your weight on the earth.

velocity:

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).