Answer:
3.07 m/s
Explanation:
We know that from kinematics equation
[tex]v^{2}=u^{2}+2as[/tex] and here, a=g where v is the final velocity, u is the initial velocity, a is acceleration, s is the distance moved, g is acceleration due to gravity
Making u the subject then
[tex]u=\sqrt {v^{2}-2gs}[/tex]
Substituting v for 6.79 m/s, s for 1.87 m and g as 9.81 m/s2 then
[tex]u=\sqrt {6.79^{2}-(2\times 9.81\times 1.87)}=3.068338313 m/s\approx 3.07 m/s[/tex]
