[单选题]
A jumper in the long-jump goes into the jump with2 9 cpbe*ss9gs a speeh 0l4fmd ahv,3d of 12 m/s at an angle oh4m af,3 ldv0hf $20^{\circ}$ above the horizontal. How far does the jumper jump?
A. $6.14 \; m$
B. $8.22 \; m$
C. $9.45 \; m$
D. $10.4 \; m$
E. $12.28 \; m$
Post time 2025-9-8 22:24:32