Question

Define speed.write the formula.what is the SI unit of speed?​

Answer 1

Answer:

speed of a body is defined as the distance travelled by it per unit time.

SI unit of speed - m/s

Answer 2

Speed:

• The distance travelled by a moving object in a unit time interval is known to be speed.

• Speed is given by the mentioned formula that is distance/time.

• The SI unit of speed is metre/second.

• Speed is a scalar quantity.

___________________

• Speed with given direction is known as the velocity.

• Velocity is the speed of an object moving in a definite direction.

Additional information:

See the difference between speed and velocity too to clear the concepts:

$\begin{gathered}\boxed{\begin{array}{c|cc}\bf Speed&\bf Velocity\\\frac{\qquad \qquad \qquad\qquad\qquad \qquad\qquad\qquad}{}&\frac{\qquad \qquad \qquad\qquad\qquad \qquad\qquad\qquad}{}\\\sf The \: distance \: travelled \: by &\sf The \: distance \: travelled \: by \\ \sf \: a \: body \: per \: unit \: time&\sf \: a \: body \: per \: unit \: time \\ &\sf in \: a \: given \: direction \\\\\sf It \: is \: scalar \: quantity. &\sf It \: is \: vector \: quantity \\\\\sf It \: is \: positive \: always &\sf It \: can \: be \: \pm \: \& \: 0 \: too \\\\\sf Speed \: = \dfrac{Distance}{Time} &\sf Velocity \: = \dfrac{Displacement}{Time} \end{array}}\end{gathered}$