A 1.0 × 10 ­kilogram box rests on the bed of a truck that is accelerating at 2.0 meters per second. What is the magnitude of the force of friction on the box as it moves with the truck without slipping? A) 0.0 N B) 5.0 × 10^2 N C) 2.0 × 10^2 N D) 1.0 × 10^3 N

You can find results and justify them? you can test your hypothesis

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.