can i get help with these questions please

55. E SSM The (nonconservative) force propelling a 1.50 x 10'-kg car up a mountain road does 4.70 x 10* J of work on the car. The car starts from rest at sea level and has a speed of 27.0 m/s at an altitude of 2.00 x 10 m above sea level. Obtain the work done on the car by the combined forces of friction and air resistance, both of which are nonconservative forces. (Hint: The work done on the car by the engine is also due to a nonconservative force but it is positive work, while the friction force and air resistance do negative work.) 63. E BIO SSM Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by seven-time-winner Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass. (a) How much work does he do during a 135-km race in which his average speed is 12.0 m/s? (b) Often, the work done is expressed in nutri- tional Calories rather than in joules, Express the work done in part (a) in terms of nutritional Calories, noting that I joule = 2.389 x 10 nutritional Calories. 72. E The graph shows how the force component F cos 0 along the dis- placement varies with the magnitude s of the displacement. Find the work done by the force. (Hint: Recall how the area of a triangle is related to the triangle's base and height.) F coso 62.0 N PROBLEM 72 1.60 m