How do credit cards use magnets to work?

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Which of the following is an example of units for speed