Acceleration is a change in velocity.
Yes.
acceleration has everything to do with gravity
Local accelleration or gravitation creates force. Mass remains constant despite presence or absence of accelleration or gravity.
Going back to the equation F=m·a you can see that if the force changes but the mass does not, accelleration will change as well. If mass and force do not change, accelleration will be constant.
16 ft./sec./sec.
0- 60 mph in 2.5 seconds
accelleration
Will skid.
The past tense of skid is skidded. Your car may skid in the rain. My car skidded across the intersection.
When a car skids, the rear end of the car is coming around, a counter skid is when you counter that first skid in an attempt to correct the skid.
When you say initial speed I assume there will be accelleration. If so you could you: s = ut + 1/2at^2. or s = 1/2(u + v)t where s is distance in meters u is initial velocity in ms v is the final velocity in ms a is accelleration in ms^-2 t is time in s If there is no accelleration then s = ut