Answer:
v = 5.4 m/s
Explanation:
We use conservation of mechanical energy, that is all potential energy in the initial state, and all kinetic energy in the final state:
[tex]m*g*h=\frac{1}{2} m*v^2\\g*1.5=\frac{1}{2} v^2\\v^2=3*g=29.4\\v=\sqrt{29.4} \\v=5.42\,m/s[/tex]
which rounded to one decimal is
v = 5.4 m/s
(in agreement with the third answer on the list)
