In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2.
A box of mass 20 kg is pulled up a rough plane inclined at an angle of 15° 15°\,15° to the horizontal by a force of magnitude 120 N acting up a line of greatest slope.
The coefficient of friction between the box and the plane is 0.3.
Find the acceleration of the box.