[单选题]
A toy rocket, weighing 10 N, blasts straight up fn:koz vny 9ck rd+vyu++ 4 fso30ii6+krjl,a psbkx,.: om ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical ,k. ,xpsba :ljheight does it rise?
A. $1.0 \; m$
B. $10 \; m$
C. $14 \; m$
D. $24 \; m$
