hey guys i am stumped on this question: mary dangles her watch from a thin piece of string, while burning rubber on her supercharged moped. she notices that the string makes an angle of 15degrees with respect to the vertical while the moped accelerates to maximum speed, which takes about 18s. what is the maximum speed of mary's moped? i am really stuck on this question and i need to show my work too. can anyone please help? thanks.