Hello everyone, just having some trouble with my assignment.

I had to find the equation for velocity using the equation for vertical displacement so I did. The question asks to find the vertical displacement when the velocity is 0.8 m/s so as you can see I subbed it into the equation above. Problem is, im having trouble solving for 't'.

Can anyone help?... It would be much appreciated.

Ill need a lot of help for calculus so I hope I don't bother these forums!