How can a element form a positive ion?

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

How is zig zagging a form of acceleration?