1.

A stone, tied to a string, is whirled round and round then position of the stone is​

Answer» ONG>Answer:

When stone reaches a position where string is horizontal, it ATTAINS the energy PARTIALLY as kinetic and partially as potential. When stone is at its lowest position, it has only kinetic energy, GIVEN by

At the horizontal position, it has energy

According to conservation of energy,

Or

Or

Or ...(i)

So, the magnitude of change in velocity

[from Eq. (i)]

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Solution Image

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