RRB Group D 23-Oct-2018 Shift 3 Solved Paper

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Question : 10 of 100

Marks: +1, -0

An athlete runs

400 \ { m}

in

20 \ { s}

. Calculate the average speed of the athlete.

$2 \ { ms}^{-1}$
$4 \ { ms}^{-1}$
$40 \ { ms}^{-1}$
$20 \ { ms}^{-1}$

Solution:

Average speed is defined as total distance travelled in the entire journey.
Total distance

=400 \ { m},

time

=20 \ { s}

Average speed

=400 / 20=20 \ { ms}^{-1}

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