Question

please answer my question
​

Answer 1

▶ Solution :

Given :

▪ A body moves in a circle of radius 7m.

▪ It completes 3.5 revolutions in 14s.

To Find :

• Average speed
• Average velocity

Concept :

✳ Average speed is defined as ratio of total distance covered to the total time taken.

✴ Average velocity is defined as ratio of total displacement to the total time.

✴ Distance is defined as total actual length of path whereas displacement is defined as the shortest distance between initial and final point of the journey.

✴ Average speed is a scalar quantity.

✴ Average velocity is a vector quantity.

Calculation :

$\implies\bf\:av.speed=\dfrac{3.5\times 2\pi{R}}{t}\\ \\ \implies\sf\:av.speed=\dfrac{3.5\times 2(22)(7)}{14\times 7}\\ \\ \implies\sf\boxed{\bf{\pink{av.speed=11\:mps}}}\\ \\ \mapsto\bf\:av.velocity=\dfrac{2R}{t}\\ \\ \mapsto\sf\:av.velocity=\dfrac{2\times 7}{14}\\ \\ \mapsto\boxed{\bf{\orange{av.velocity=1\:mps}}}$

✒ Option : B) is correct