When you are talking about the Principle of mechanical Energy Conservation, it is really only including the kinetic and potential energy in a total system. When frictional forces are present, although the conservation of energy law is still present, it does not work when it comes to the conservation of mechanical energy as there is another type of energy that is factored in. As friction acts on the object, that transition from potential to kinetic as it slide/falls will be completely different as some of that energy is being transformed into thermal energy. Which breaks the conservation of mechanical energy.
Answer:
The new time period will be T.
Explanation:
The time period in terms of spring constant and mass is given by :

If mass and force constant is doubled, m' = 2m and k' = 2k
New time period is given by :




So, the new period will remains the same. Hence, the correct option is (C).
Answer:
Explanation: B. A change in particle position
Answer:
The correct equation for calculating force is change in momentum divided by time. So 10 kg m/s divided by 3 s is 3.3 newtons (N
Explanation: