A 30 kg object with a sliding force of friction equaling 5 N will accelerate at? A) -5 m/s/s
B) -6 m/s/s
C) -.0167 m/s/s
D) -.167 m/s/s

We can't know that since we have only the friction force but not the force applied to the body. Please, control if you have written the question correctly.

EDIT: It's impossible knowing it's acceleration if you don't give us more informations...

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.