Answer:
a) Wf = 5808 J
b) Wg = -5280 J
c) Kf = 528 J
d) Vf = 4.7 m/s
Explanation:
The force exerted by the helicopter is:
F - m*g = m*g/10
F = 11 / 10 * m * g = 528 N
So, the work done by the helicopter was:
Wf = F*h = 528 * 11 = 5808 J
The work done by gravitational force is:
Wg = -ΔUg = - m*g*h = -5280J
Kinetic energy is:
Kf + ΔUg = Wf
Kf = Wf - ΔUg = 5808 - 5280 = 528 J
And her speed is:
[tex]Vf = \sqrt{2*Kf/m}[/tex]
Vf = 4.7 m/s