Sorry if this is in the wrong section, I wasn't sure where to post it. Can anyone help me - I need to solve the following differential equation and find the values of c and B. > k is given as -98.3146. > v = 55 when t = 9 > v = 50 when t = 10 k(v^2) + B = m.(dv/dt) Am I right in thinking that by separation of variables and integration I get arctan(v/sqrt(B/k))=kt/m + c ?? But then if so, how do I find the values of c and B? Thanks for any help, Simon.