erialai

thanks for the help, i tried solving it in that way and i'm still getting the wrong answer. Heres what I've done/:

this is hat i get... i've made many attempts on it smh

The thing is i need find the time and in order to get that i need to integrate which I'm unable to do with that equation

So i'm stuck on a tutorial I've been sent to do, could anyone help me out please? i have no idea where to start, I've looked through all my previous lecture notes but i can't find a logical way to solve the problems. i've attached the tutorial. Thanks.