A particle travels along the arc of a circle of radius `r`. Its speed depends on the distance travelled `l` as `v=asqrtl` where 'a' is a constant. The angle `alpha` between the vectors of net acceleration and the velocity of the particle is

Options

A. `alpha = tan^(-1)(2l//r)`
B. `alpha = cos^(-1)(2l//r)`
C. `alpha = sin^(-1)(2l//r)`
D. `alpha = cot^(-1)(2l//r)`

Answer

a