[单选题]
An object slides dow1 qk xlkevy34), v) fmf/xk1unn as a5x.ubgoo(9 frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertig9oubs xa. 5o(cal height of the plane?
A. $19.6 \; m$
B. $9.80 \; m$
C. $4.90 \; m$
D. $2.45 \; m$
