When the $4-kg$ bob is given a horizontal speed of $1\mathrm{.}5\frac{m}{s},$ it begins to rotate around the horizontal circular path $A.$ The force $F$ on the cord is increased, the bob rises and then rotates around the horizontal circular path $B.($Figure $1)$

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Part A

Determine the speed of the bob around path $B.$

Express your answer to three significant figures and include the appropriate units.

$v=$ Value

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Part B

Find the work done by force $F$;

Express your answer to three significant figures and include the appropriate units.

$U_F=$

$$

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