A boat travels across a river. It has a velocity component of magnitude v1 v_1\,v1 perpendicular to the riverbank and another velocity component of magnitude v2 v_2\,v2 parallel to the riverbank.
Which of the following expressions represents the magnitude of the boat's resultant velocity, vvv?
v12+v22\sqrt{v_1^2 + v_2^2}v12+v22
v1+v2v_1 + v_2v1+v2
v1+v2\sqrt{v_1 + v_2}v1+v2
v12+v22\sqrt{v_1^2} + \sqrt{v_2^2}v12+v22
164 exam-style questions on CIE IGCSE Physics Physical quantities and measurement techniques, covering Physical quantities and measurement techniques. Each one has a worked solution and a mark scheme showing where the marks go.