# application of work-energy theorm

In the figure, two blocks are connected by a string across a pully. m1 sits at rest on a table.

m1 = 3.4 kg. Use work and energy to find the speed of the m2 = 2.5 kg block just before it hits the floor in each of the following cases.

* Distance between the floor and m2 = 1.5

(a) The table is frictionless.

(b) The coefficient of kinetic friction of the 3.4 kg block is 0.15.

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## SOLUTION This solution is **FREE** courtesy of BrainMass!

Please see the attached file for detailed solution.

(a) The tension of the cable is the internal force, so we don't need to consider this force when analyzing m1 and m2 as a system.

For m1, the gravity m1g and the normal force from the table are both perpendicular to the motion in the horizontal direction.

So the only force does work to the system is m2g.

Using the work-energy theorem, just before m2 hits the ground,

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