[单选题]
97.09: At a certain time, k/xyraoarh+(r,9 ) i da hu.fspt5y8a4b-5ph rn object in free fall has velocity 4.0 m/s in the upward direction. What is the app4 h-fyapu85 stp rb.5hroximate velocity of the object one second later?
A. 14 m/s up
B. 10 m/s up
C. 4.0 m/s up
D. 6.0 m/s down
E. 10 m/s down