Homework Help: physics

Posted by sweety on Saturday, March 21, 2009 at 7:41pm.

In the Figure the pulley has negligible mass, and both it and the inclined plane are frictionless. Block A has a mass of 1.3 kg, block B has a mass of 2.7 kg, and angle è is 26 °. If the blocks are released from rest with the connecting cord taut, what is their total kinetic energy when block B has fallen 27 cm?

physics - bobpursley, Saturday, March 21, 2009 at 7:44pm
I have difficulty telling which is which, I assume block b is hanging straight down, and block a is on the incline.

difference PE=final KE
massa*g*h-massb*g*hsin26=totalKE
you know h (.27m) and g, solve for total KE.

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