The displacement of a body at any time \( t \) after W starting is ...

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The displacement of a body at any time \( t \) after
W starting is given by \( s=10 t-\frac{1}{2}(0.2) t^{2} \). The velocity of the body is zero after:
(A) \( 50 \mathrm{~s} \)
(B) \( 100 \mathrm{~s} \)
(C) \( 80 \mathrm{~s} \)
(D) \( 40 \mathrm{~s} \)
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