A wire AB 10 metres long is bent into an arc of a circle. It is mounted in a vertical plane so the tangent at B is horizontal and the tangent at A is at 40 degrees to the horizontal, with the level of B below the level of A. A bead of mass 2 grams is threaded on the wire at A and released. Find its speed when it reaches B
a. if the wire is smooth
b. if there is a resistance of constant magnitude 0.004 newtons
The answers are 8.10 and 5.07. There is no diagram that comes with the question.