A powerful motorcycle can produce an acceleration of 3. 50m/s2 while traveling at 90. 0 km/h. At that speed, the forces resisting motion, including friction and air resistance, total 400. 0 n. (air resistance is analogous to air friction. It always opposes the motion of an object. ) what is the magnitude of the force that the motorcycle exerts backward on the ground to produce its acceleration if the mass of the motorcycle with a rider is 245 kg?.