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`Consider a problem in which a car of mass M is on a road tilted at an angle theta. The normal force:`

- N=M*g
- N=M*g*cos(theta)
- N=(M*g)/cos(theta)
- is found using sum vec{F}=M * a

from my calculations, i get that N=M*g*cos(theta)...but when i enter that choice it marks my answer wrong. I am getting a B in this class because this stupid f**ing Mastering Physics website...i HATE THIS COURSE....i have basically already taken it but i feel so stupid...i wonder what ppl are feelign like who havn't already gotten a 5 on the AP test for this course...anyways any help will be GREATLY appreciated!!!!!!!!!!!!!