Total mechanical energy

1. Find an expression for the total mechanical energy when the string is extended and find the maximum distance that the particle falls in terms of g

Unsure

3. My attempt at solution

Hi :tongue: Here is the question I am looking at http://ift.tt/1oDIAIb

I take the datum as the fixed point so there is no kinetic energy to start with.

There is potential energy of mgx which is (4kg)(9.81m/s^2)(0.5) = 19.62 Joules

Kinetic energy is (1/2)mv^2, therefore 4v^2 as mass is 4kg

So total mechanical energy is (kinetic energy) + (potential energy) = 5.886J + 4v^2

Not sure if that is correct as I find this very confusing, and can’t get an idea of how to answer the question that asks for the maximum distance that the particle falls

http://ift.tt/PK8VEA

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