Time left O:18:45 A boy takes 18.8 seconds to slide down a smooth inclined plane of angle such that tan(0) = 0.8, starting from rest. How long (in seconds) he takes to slide down an identical rough inclined plane of friction coefficient 0.76, if he starts from rest? Answer:Two constant forces F1 = 7.4 i+3.4 j +7.6 k N and F2 = 3.7i-1.6 j -4.8^k N act together on an object causes a displacement from position r1 = 8.7"i+ 6.6 j + 4.9 k cm to position r2= 9"i + 8.8 j + 4.2"k cm. Determine the total work done (J) on the object