Question

define speed for class 7​

Answer 1

Answer:

Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. ... An object with no movement at all has a zero speed.

Explanation:

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Answer 2

The rate of change of distance along a path per unit of time is called speed. The SI unit of speed is metres per second and the practical unit is kilometres per hour. The body which covers a large distance in unit time moves at a high speed.

To find the speed of a body moving uniformly, the distance traversed by the body in some time interval is divided by the time taken.

Speed = $\frac{distance \: covered}{time \: taken}$

Speed is of two types:Uniform speed and variable speed.

• When a body covers equal distances in equal intervals of time, it is said to be moving with a Uniform or constant speed.

• When a body covers unequal distances in equal intervals of time or equal distances in unequal intervals of time, then speed is said to be Variable speed. In such a case, the average speed is calculated.

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