Question

An object moves from A to B with a speed of 20 m/s and returns from B to A with a speed of 40 m/s. The average velocity of the object for whole journey is
(A) 80/3 m/s
(B) 60/3 m/s
(C) 30 m/s
(D) zero

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Answer 1

Given:

An object moves from A to B with a speed of 20 m/s and returns from B to A with a speed of 40 m/s.

To find:

The average velocity of the object for whole journey?

Calculation:

Average Velocity is defined as the ratio of total displacement and total time to cover that specific displacement.

$\sf \: avg. \: v = \dfrac{total \: displacement}{total \: time}$

• Now, since the object returns back to its starting position, the displacement is zero.

$\sf \implies \: avg. \: v = \dfrac{0}{total \: time}$

$\sf \implies \: avg. \: v = 0$

So, average velocity of the object is zero.

Answer 2

$\begin{gathered}\huge{\textbf{\textrm{\underline{\underline{\color{green}{Question:-}}}}}}\end{gathered}$

● An object moves from A to B with a speed of 20 m/s and returns from B to A with a speed of 40 m/s. The average velocity of the object for whole journey is

❒ 80/3 m/s

❒ 60/3 m/s

❒ 30 m/s

❒ zero

$\begin{gathered}\huge{\textbf{\textrm{\underline{\underline{\color{brown}{Answer :-}}}}}}\end{gathered}$

➠ What is average speed?

➠ Average Velocity is defined as the ratio of total displacement and total time to cover that specific displacement.

❍ $\sf \: average \: velocity = \dfrac{total \: displacement}{total \: time}$

➽ $\sf \: average \: velocity = \dfrac{0}{total \: time}$

➻ $\bf\red{average \: velocity = zero}$

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