Make 2as 2as\,2as the subject of the formula v2=u2+2asv^2 = u^2 + 2asv2=u2+2as
Hence make a a\,a the subject of the formula
215 exam-style questions on Eduqas GCSE Maths Rearranging Harder Formulae. Each one has a worked solution and a mark scheme showing where the marks go.