Answer:
V=15.46m/s
Explanation:
By making an energy balance:
Initial energy: 
where K=1100N/m and X=4m
Final energy: 
where m=60kg and h=2.5m
Work done by friction force: -Ff*X where Ff = 40N and X=4m
The balance will be:
Solving for V:
using g=9.8m/s^2
Hook's law states that
where F is the applied force, k is the spring constant, and 
is the change in length.
Plugging your values, we have
The Photosphere is the right answer
Answer:
When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. ... In addition, gas molecules leaving the liquid remove thermal energy from the liquid. Therefore the temperature of the liquid remains constant during boiling.
