Answer:
<em>16275 Joule</em>
Explanation:
<u>Work Done By A Constant Force
</u>
The work can be computed as
W=F.X, where F is the applied force (in this case, the force needed to overcome gravity)
Recall the second Newton's law which states that
Being the net force on a system of mass m and acceleration a
We know the helicopter is applying force against gravity because the speed of the shipwreck survivor changes from 4 m/s to 0 m/s in 15 meters
Let's calculate that acceleration by using the dynamics equation
Solving for a
a=-0.533\ m/sec^2
The negative sign indicates the body is braking, we'll later use the magnitude
The net force is, then
The only two forces acting upon the survivor is the lifting force of the helicopter and the weight of the man, so
Finally, the work done by the helicopter is
The work done by the helicopter is
Answer:
Yes it can
Explanation:
I remembered it from my brain!!!!