Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) The 1800 kg tractor exerts a force of 1.55 x 10° N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.130 m/s?, what is the mass of the airplane in kilograms? kg (b) Calculate the force (in N) exerted by the tractor on the airplane, assuming 2000 N of the friction is experienced by the airplane. Additional Materials O Reading

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!