Two small metal cubes with masses $2\mathrm{.}0$ gg and $4\mathrm{.}0$ gg are tied together by a $4\mathrm{.}7-$cmcm$-$long massless string and are at rest on a frictionless surface. Each is charged to $+2\mathrm{.}5$ CC$.$

Part A

What is the energy of this system?

Express your answer in joules.

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EmechEmech $=$

nothing

JJ

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Part B

What is the tension in the string?

Express your answer with the appropriate units.

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TT $=$

nothingnothing

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Part C

The string is cut. What is the speed of $2-$gg$-$cube when the cubes are far apart?

Hint: There are two conserved quantities. Make use of both.

Express your answer with the appropriate units.

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vv $=$

nothingnothing

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Part D

The string is cut. What is the speed of the $4-$gg$-$cube when the cubes are far apart?

Hint: There are two conserved quantities. Make use of both.

Express your answer with the appropriate units.

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vv $=$

nothingnothing