Question

Consider simple pendulum — a small bob of mass m tied to an inextensible massless string of length L. The other end of the string is fixed to a rigid support. The bob oscillates in a plane about the vertical line through the support. Let θ be the angle made by the string with the vertical.

a) Can an object executing SHM have acceleration without having velocity? b) Can an ideal simple pendulum be constructed in practice? Give reason too.