Aroller coaster car rapidly picks up speed as it
rolls down a hlope. as it starts down the slope,
its speed is 4 m/s. but 3 seconds later, at the
bottom of the slope, its speed is 22 m/s. what is
the car’s acceleration?

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?