[单选题]
A trapeze artist is swinging from position A to posfpbx :z3g r-vz8 q-ae; pk1tt3:v;i.o cw e:djition C as shown in the diagr1::kw ;vce3djoip. t tam.
[Source: Image created using Images by OpenClipart-Vectors from Pixabay - https ://pixabay.com]
The combined mass of the artist and the swing is 70 kg and the length of the rope of the swing is L Which expression gives the kinetic energy at position B?
A. $\frac{L(T-700)}{2}$
B. $\frac{LT}{2}$
C. LT
D. $\frac{L(T+700)}{2}$
