Answer:
0.97332 m/s
0.00043 m
Explanation:
u = Initial velocity
v = Final velocity
m = Mass of flea
Change in Kinetic Energy
[tex]E=\frac{1}{2}m(v^2-u^2)\\\Rightarrow 1.8\times 10^{-4}=1.9\times 10^{-4}(v^2-0)\\\Rightarrow v=\sqrt{\frac{1.8\times 10^{-4}}{1.9\times 10^{-4}}}\\\Rightarrow v=0.97332\ m/s[/tex]
The velocity of the flea when leaving the ground is 0.97332 m/s
Work done is given by
[tex]W=F\times s\\\Rightarrow s=\frac{W}{F}\\\Rightarrow s=\frac{1.8\times 10^{-4}}{0.41}\\\Rightarrow s=0.000433\ m[/tex]
The flea will travel 0.00043 m upward
