The object is released from rest under gravity at \( y=0 \). The equation of motion which correc...

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The object is released from rest under gravity at \( y=0 \). The equation of motion which correctly expresses the above situation is
(a) \( v=-9.8 t \mathrm{~ms}^{-1} \)
(b) \( y=-4.9 t^{2} \mathrm{~m} \)
(c) \( v^{2}=-19.6 y \mathrm{~m}^{2} \mathrm{~s}^{-2} \)
(d) All of these
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