Inside a cart that is accelerating horizontally at acceleration \vec{a}, there is a block of mass M connected to two light springs of force constants k_{1} and k_{2}. The block can move without friction horizontally. Find the vibration frequency of the block.
Answer Choices
A. \frac{1}{2 \pi} \sqrt{\frac{k_{1}+k_{2}}{M}+a}
B. \frac{1}{2 \pi} \sqrt{\frac{k_{1} k_{2}}{\left(k_{1}+k_{2}\right) M}}
C. \frac{1}{2 \pi} \sqrt{\frac{k_{1} k_{2}}{\left(k_{1}+k_{2}\right) M}+a}
D. \frac{1}{2 \pi} \sqrt{\frac{\left|k_{1}-k_{2}\right|}{M}}
E. \frac{1}{2 \pi} \sqrt{\frac{k_{1}+k_{2}}{M}}
