Question

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. What is the average speed of the body for the entire journey?

• A. $0.5m{s}^{-1}$
• B. $0.7cm{s}^{-1}$
• C. $0.7m{s}^{-1}$
• D. $0.8cm{s}^{-1}$

Answer 1

The correct option is C

$0.7m{s}^{-1}$

Total distance travelled = 200+220 =420 cm = 4.2 m

Total time taken= 2 + 4 = 6 sec

speed = $\frac{totaldistancetravelled}{totaltime}=\frac{4.2}{6}=0.7m{s}^{-1}$