What does metres per-second, per-second mean when explaining this?
As with acceleration, I get that 4ms^-1 means an object is travelling four metres every second.
Thanks
For your example then the velocity of the object increases by 4 m/s every second i.e if it starts at 0 m/s at t = 0 (v(0)) then v(1) = 4 m/s, v(2) = 8 m/s, v(3) = 12 m/s etc.