Question

A body travels at a speed of 10 m $s^{-1}$ for a time interval and at a speed of 40 m $s^{-1}$ for the next time interval. Find the average speed for the total journey if both the time intervals are equal.

• A. 40 m $s^{-2}$
• B. 20 m $s^{-2}$
• C. 5 m $s^{-2}$
• D. 25 m $s^{-2}$

Answer 1

The correct option is D 25 m $s^{-2}$

Here, the average speed $=\frac{v_1+v_2}{2}=\frac{40+10}{2}=25m/s$