Question

If an object travels at a speed of $20m{s}^{-1}$ for the first $2seconds$ and $30m{s}^{-1}$ for the next 3 seconds, what is the total distance travelled?

• A. $60m$
• B. $100m$
• C. $150m$
• D. $130m$

Answer 1

The correct option is D $130m$

Given:
Speed in the first $2seconds$ = $20m{s}^{-1}$
Distance travelled = speed $\times$ time =$20\times 2=40m$

Speed in the next $3seconds$ = $30m{s}^{-1}$
Distance travelled = $30\times 3=90m$

$\therefore$Total distance travelled $=40+90=130m$