Question

The average speed of a body in the above diagram is

• A. 16.67$\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$
• B. 1.67 $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$
• C. 0.167 $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$
• D. 166.7$\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$

Answer 1

The correct option is B

1.67 $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$

Step 1: Given data

Given that,

Total time taken = $120s$

Total distance = $255m-55m=200m$

Step 2: Calculation for average speed

As we know,

$$\begin{gathered} Averagespeed=\frac{Totaldis\tan ce}{Totaltimetaken} \\ =\frac{200m}{120s} \\ =1.67\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right. \end{gathered}$$

Hence, (B) is the correct answer.