Explain the solution please how did that happen A 50 000-kg freight car is pulled 800 m up along a 1.20 percent grade at constant speed. (a) Find the workdone against gravity by the drawbar pull. (b) If the friction force retarding the motion is 1500 N, find the6.32total work done.Ans. (a) 4.70 MJ; (b) 5.90 MJGivenRequiredm = 50000 kgW = ?%3Dd = 800 mF, = 1500 Ngrade = 1.20 %Solution( a ) Find the work done against gravity by the drawbar pull 3()e = tan1.2W - mghW = (50000 kg) (O.8 m/s') ( 9.6 m)1000.6875°%3Dh - s x sin ( 0.6875 )= 470400 J I(4.70 mJ%3Dh - 800 х sin ( 0,6875h = 9,59 m( b ) f the friction force retarding the motion is 1500 N. find the totalwork doneW - F x dW = 1500 N x 800 m- 120000 J I 1.2 mJWi- Wg+ Wr%3DW = 4.70 mJ + 1.2 mJ5.90 mJ%3D

Given:-mass of freight car (m)=50000 kgheight upto which it is pulled (h)=800 mGrade…

6.32 A 50000-kg freight car is pulled 800 m up along a 1.20 percent grade at constant speed. (a) Find the work done against gravity by the drawbar pull. (b) If the friction force retarding the motion is 1500 N, find the total work done. Ans. (a) 4.70 MJ; (b) 5.90 MJ