8RB Group D 23-Sep-2018 Shift 1 Solved Paper

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Question : 2 of 100

Marks: +1, -0

An object of mass

1 \ { kg}

has a potential energy of

2 \ { J}

relative to the ground, when it is at a height of: Take

\ {g}=10 \ { m} \/ {s}^{2}

$0.2 \ { m}$
$1 \ { m}$
$0.1 \ { m}$
$0.5 \ { m}$

Solution:

Mass

=1 \ {Kg},

Potential Energy

(\ {P.E.})=2 { J}

and

\ {g}=10 { m} \/ {s}^{2}

P.E.

={m}×{g} ×{h}

2=1 \×10 ×{h}

{h}=2 / 10

Or

1 / 5=0.2 { m}

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