Here is the problem which I am struggling on, please help me!
Problem: To test your friend's claims about his car, you accept his offer of a ride about campus. Not wanting to exceed the speed limit, he claims he can only give a taste of the accelerating ability of his car and not the full proof. You notice, however, that the pine tree scented (and shaped) air freshener that hangs from his rear view mirror makes an angle of 21.1 degrees with the vertical while he is accelerating.
Part I: What is the car's acceleration (m/s2)?
Part II: What is the tension (N) in the string of the 100-g air freshener (assume only one string hanging from the mirror)?
Please show how you obtained the answer.