Speed Bead

Speed and net work. Please explain. 10 points for best answer!?

A bead of mass m = 5.50 kg is released from point A and slides on the frictionless track. The height of A is h(sub)a = 5.70 m. The height of point b is 3.2 meters, and the height of c is 2.0m.
a) Determine the bead’s speed at points B and C.
I know at point b the speed is 7.003 m/s, but what about c?
(b) Determine the net work done by the force of gravity in moving the bead from A to C.

How did you get the speed at point B? Find the speed at point C the same way.

In moving from A to another point, the potential energy difference is mg*(height difference compared to A). This is true for both B and C.

Set this equal to kinetic energy (1/2)mv^2 to solve for the speed v.

All of the work done by gravity goes into KE, so the work done is equal to the final KE.

Speed Bead : Kandi Poison

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