RRB Group D 27-Sep-2018 Shift 1 Solved Paper

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Question : 4 of 100

Marks: +1, -0

A car accelerates uniformly from

18 \ {kmh}^{-1}

to

72 \ {kmh}^{-1}

in

5 \ { s}

. The acceleration of the car is:

$3 \ { ms}^{2}$
$10.8 \ { ms}^{-2}$
$10.8 \ { ms}^{2}$
$3 \ { ms}^{-2}$

Solution:

Acceleration of a Car

v_{1}=18 {kmh}^{-1}

i.e.

5 \ { ms}^{-1}, \ {v}_{2}=72 \ {kmh}^{-1}

i.e.

20 \ { ms}^{-1}

Acceleration of a car

=\ {{v}_{2}-\ {v}_{1}} / {\time}

Time

=5

seconds

a=20-5 / 5=15 / 5

i.e

3 \ { ms}^{-2}

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