The boy jumps off the flat car at $\backslash ($ A $\backslash )$ with a velocity of $\backslash ($ v$=4\backslash$mathrm$\{$ft$\}/\backslash$mathrm$\{$s$\}\backslash )$ relative to the car as shown. He lands on the second flat car $\backslash ($ B $\backslash ).$ Each car has a weight of $72$ lb $.$ The boyD's weight is $60$ lb $.$ Both cars are originally at rest. Neglect the mass of the carDs wheels. $($Figure $1)$

Determine the speed of car $\backslash ($ A $\backslash ).$

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

$\backslash [$

v$\_\{$A$\}=$

$\backslash ]$

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Part B

Determine the speed of car $\backslash ($ B $\backslash ).$

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

$\backslash [$

v$\_\{$B$\}=$

$\backslash ]$

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