A trolley filled with sand moves on a smooth horizontal surface with a velocity v0. A small hole...

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A trolley filled with sand moves on a smooth horizontal surface with a velocity v0. A small hole is made at the base of it from which sand is leaking out at constant rate. As the sand leaks out then which of the following is incorrect?

(1) The velocity of the trolley increases
(2) The velocity of the trolley remains constant
(3) The momentum of the trolley is conserved
(4) The momentum of the total system (trolley with sand + leaked out sand) is conserved in horizontal direction
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