Airplane a travels 1400 km at a certain speed. plane b travels 1000 km at a speed 50 km divided by h faster than plane a in 3 hrs less time. find the speed of each plane.

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

Which statement best describes how private industry decides where to spend the money on research and development

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?