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Question : How long will it take to travel that 1 metre?

NOTE: The surface is a frictionless surface. The mass of the trolley is 0.5kg

My method:

F = ma , F = (0.5+1) X 9.8 = 14.7N

W= Fd , W = 14.7 X 1 = 14.7J

Ek = 1/2mv^2

14.7 = 0.5 X 1.5 X v^2

v^2 = 19.6, v = 4.427 m/s

v = d/t

t = d/s

t = 1/4.427

t = 0.226s