Mass of a particle is \( 0.50 \mathrm{k} \). It is moving initially \( \mathrm{P} \) with the sp...

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Mass of a particle is \( 0.50 \mathrm{k} \). It is moving initially
\( \mathrm{P} \) with the speed by \( 80 \mathrm{~m} / \mathrm{s} \) towards east. At \( \mathrm{t}=0 \),

W. when particle is at \( x=0 \), a force of \( 20 \mathrm{~N} \) directed towards west is being applied on it for \( 4 \mathrm{sec} \). Its position after \( 5 \mathrm{sec} \) is :-
(1) \( 80 \mathrm{~m} \)
(2) 0
(3) \( -40 m \)
(4) \( -80 \mathrm{~m} \)
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