Answer:
E = 4410 J
Explanation:
The net energy change is equal to the change in potential energy
ΔPE = mgΔh = 50(9.8)(16) = 7,840 J
However some of that energy went into the stretch of the spring.
that stretch is found setting the spring force equal to the weight
kx = mg
x = 50(9.8)/35 = 14 m
so energy stored in the spring is
PS = ½kx² = ½(35)(14²) = 3,430
energy lost to friction is 7840 - 3430 = 4,410
Your answer is 7.009m/s
If you would like to show how I solved this just ask. :)
Hope this helps -John
Answer:
Explanation:
We can use the equation of speed in terms of distance. We know that the speed of light is constant value so we will have:
Now we know that 
I hope it helps you!
Answer:
Q=∆U+W
Explanation:
work done+ change in internal energy = heat supplied to change the internal energy
(1st law of thermodynamics)
