Answer:
Explanation:
mass of helicopter, m = 72 kg
height, h = 15 m
acceleration, a = g/10
(a) Work done by the force
Work, W = force due to helicopter x distance
W = m x ( g + a) x h
W = 72 ( 9.8 + 0.98) x 15
W = 11642.4 J
(b) Work done by the gravitational force
W = - m x g x h
W = - 72 x 9.8 x 15
W = - 10584 J
(c) Kinetic energy = total Work done
K = 11642.4 - 10584
K = 1058.4 J
(d) Let the speed is v.
K = 0.5 x m v²
1058.4 = 0.5 x 72 x v²
v = 5.42 m/s
Now the force of lift by the helicopter:
where:
force by the helicopter
force of gravity
b)
The gravitational force on the astronaut:
d)
Since the astronaut has been picked from an ocean we assume her initial velocity to be zero,
using equation of motion:
c)
Hence the kinetic energy:
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