[单选题]
A trapeze artist is swinging from pos g95d0nv6cg q: xae/tcition Ap0ozws fa.40 h to position C as shown in the diagrapf40hw a so0z.m.
[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. $\frac{L(T+700)}{2}$
