The work done by the force of gravity is...

The work done by the force of gravity is 100 J

If bob is given an initial velocity `u=12` m/s it complete the loop

If `u=8m//s` maximum height attained by bob is 4 m

If `u=10m//s,` maximum height attained by bob is 4 m

If `u=2 m//s,` it excautes oscillation

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