Question

1.What is speed ?
2.What is mass ?
3. What is unit ?
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Answer 1

SPEED

In everyday use and in kinematics, the speed (commonly referred to as v) of an object is the magnitude of the change of its position; it is thus a scalar quantity.[1] The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval;[2] the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

Speed

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Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a given amount of time, while a slow-moving object covers a relatively small amount of distance in the same amount of time.

Common symbols

v

SI unit

m/s, m s−1

Dimension

L T−1

MASS

Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied forces.

Unit

A unit is any standard used for making comparisons in measurements. Unit conversions allow for measurements of a property that have been recorded using different units—for instance, centimeters to inches.

Answer 2

Answer:

1. Speed : Speed can be thought of as the rate at which an object covers distance.

2. Mass:Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied.

3. Unit: A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

Explanation:

1. speed: Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour.
2. Mass: An object's mass also determines the strength of its gravitational attraction to other bodies. The basic SI unit of mass is the kilogram.
3. Unit : Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.

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