First slide

Rectilinear Motion

Question

A runner travels around a rectangular track of length 70m and width 30m. After travels around the rectangular track two times, runner back to starting point. Determine distance travelled by the runner.

Easy

A

100m
B

200m
C

300m
D

400m

Solution

Given that l=70m
b=30m
$∴$ For one complete round, the distance travelled
=Total length of rectangle
$\begin{array}{l} = 2 (l + b) \\ = 2 (70 + 30) = 2 (100) \\ = 200 m \end{array}$
$∴$ For two complete rounds, the total distance
Travelled S=2x200
=400m

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