Hi, im having trouble with some questions, here's one, i will post more as i run into more problems.

The acceleration of an object, moving in a line at t seconds is given by if the object has an initial velocity of 4 m/s then v is equal to?

Now you'd think i would just have to integrate a and find the c constant, so i got:

but the answer was this:

can someone explain why this is correct?