Question

solve this problem...​

Answer 1

ANSWER :-

a)

Given,

The disc is initially in rest

So energy stored at top is potential energy = mgh

When the disc comes down and joins the block , the combined mass forms a system with combined mass (m+M)

Let's assume this combined mass have attained a velocity "v"

So, the Kinetic energy gained by the combined system is

$k.e \: = \frac{1}{2} (m + M) {v}^{2}$

Now coming to the point , work done

WORK DONE :-

Work done by friction is defined as change in the total energy of the body(system)

$WORK DONE = \: mgh \: - \: \frac{1}{2} (m + M) {v}^{2}$

b)

And coming to the second part of the question,

Here the body comes into rest due to friction and there is a no question of non inertial frame of reference for the above phenomenon

So I think it doesn't change.

Answer 2

Answer:

Hi bro

How are you

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