[单选题]
A sailboat of mass m is moving with a momentum p. Ho;qj lw; +up(3; eb7vf bfj.k7clu(yjfw would you u dh r-9ei; qep/wsq02lu.mm7represent its kinetic energy in terms of the9m 0idq2lersp7hm/q ;.u euw -se two quantities?
A. $p^2/2m$
B. $\frac{1}{2} mp^2$
C. $mp$
D. $\frac{1}{2} mp$
