Two masses, $m_A=35\mathrm{.}0kg$ and $m_B=40\mathrm{.}0kg,$ are connected

by a rope that hangs over a pulley $($as in the figure $($Figure $1)).$

The pulley is a uniform cylinder of radius $0\mathrm{.}381m$ and mass $3\mathrm{.}4$

$kg.$ Initially $m_A$ is on the ground and $m_B$ rests $2\mathrm{.}4m$ above the

ground.

Figure

$1$ of $1$

Part A

If the system is released, use conservation of energy to determine the speed of $m_B$ just before it strikes the ground. Assume the pulley bearing is frictionless.

Express your answer using two significant figures.

$v=$

$\frac{m}{s}$

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