The displacement of a particle varies according to the relation $x = 4(cos\pi t + sin\pi t).$ The amplitude of the particle is
A$8$
B$-4$
C$4$
D$4\sqrt 2 $
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D$4\sqrt 2 $
d (d) For given relation
Resultant amplitude $ = \sqrt {{4^2} + {4^2}} = 4\sqrt 2 $
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