A student solving for the acceleration of an object has applied appropriate physics principles and obtained the expression a=a1+fm where a1=3. 00 meter/second2, f=12. 0kilogram⋅meter/second2 and m=7. 00kilogram. First, what would be the correct step for obtaining a common denominator for the two fractions in the expression in solving for a?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.