Question

Ramu moves along the periphery of a square field of side 10 m. He completes travelling one side in 40 s, the magnitude of distance at the end of 2 minutes and 20 seconds is

• A. 35 m
• B. 25 m
• C. 15 m
• D. 20 m

Answer 1

The correct option is A 35 m

Distance covered=Length of one side of square field = 10 m
Time taken to cover one side of the field, t = 40 s
We know, speed = $\frac{distance}{time}$
$\Rightarrow$speed, s = $\frac{10}{40}$= $0.25m{s}^{-1}$
Now we have to find the magnitude of distance at the end of 2 minutes and 20 seconds.
Here time taken, t = [$2\times 60$] + 20 = 140 s
$\therefore$Distance covered = $speed\times time$ = $0.25\times 140$ = 35 m