Question $2$

The crate has a mass M and is subjected to a towing force P acting at an angle ${}_1$ with horizontal. If the coefficient of static friction is ${}_s,$ determine the magnitude of $P$ to just start the crate moving down the plane

Given: $M=350kg,{}_1=20$deg,${}_2=10$deg,${}_s=0\mathrm{.}5.g=9\mathrm{.}81\frac{m}{s^2}$