according to fig. 4.4, two weighty blocks, 450 n and 850 n are held on an inclined plane. the rod is perpendicular to the ground. 450 n block and the plane have a 0.2 coefficient of friction, while 850 n block and the plane have a 0.3 coefficient of friction. when the motion down the plane is ready to begin, measure the plane's inclination with the horizontal and the tension in the rod