1- A powerful motorcycle can produce an acceleration of 4,0 m/s2 while traveling at 90.0 km/h. At that speed the forces resisting motion, including friction and air resistance, total 400 N. (Air resistance is analogous to air friction. It always opposes the motion of an object.) What is the magnitude of the force, in Newtons, that the motorcycle exerts backward on the ground to produce its acceleration if the mass of the motorcycle with a rider is 250 kg?

2-What force in Newtons does a trampoline have to apply to a 54-kg gymnast to accelerate her straight up at 6,1 m/s2? Note that the answer is independent of the velocity of the gymnastshe can be moving either up or down, or be stationary.