Does someone know were i can get the answers to the gizmo energy of a pendulum

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

yup its correct its: c) b b

it would be kevlar ^^

no. dot product   =0 when vecs at right angles