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Answer 1 · 2018-08-07T17:53:52

# -4sqrt2"metre."#

Given that, #x=4cos(pit+pi/4)#

#:. t=0 rArr x=4cos(pixx0+pi/4)=4cos(pi/4), and, #

#t=1 rArr x=4cos(pi+pi/4)=-4cos(pi/4)#.

#:.," The required displacement"=-4cos(pi/4)-4cos(pi/4)#,

#=-8cos(pi/4)#,

#=-8/sqrt2#,

#=-4sqrt2"metre."#