A trolley filled with sand moves on a smooth horizontal surface with a velocity ` V _(0)`. A smalll hole is made at the base of if from which sand is leaking out vertically down a constant rate. As the sand leaks out
(a) the velocity of the trolley remains constant
(b) the velocity of the trolley increases
(c ) the velocit of trolley decreases
(d) the momentum of trolley + leaked out sand is conserved

Options

A. a & b are correct
B. c &d are correct
C. a & c are correct
D. b &d are correct

Answer

D