A particle undergoes forced vibrations according to the law x (t) + 25 – McqOptions

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1.	A particle undergoes forced vibrations according to the law x (t) + 25x(t) = 21 sin t. If the particle starts from rest at t=0, find the displacement at any time t>0.
A.	( frac{21 cos t}{25} )
B.	( frac{7 sin t}{8} )
C.	( frac{3 cos t}{8} )
D.	( frac{7 sin t}{9} )
Answer» C. ( frac{3 cos t}{8} )

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