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Posted by on Sunday, March 22, 2009 at 12:05am.

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 and in ths block b is hanging down? i jus wanted to ask that difference PE=final KE means
mass of a*g*h-mass of b*g*hsin26=totalKE. is this right? bcause i m nt getting right answer. for a height should be h= 0.27cos26 and for b height=0.27?

  • physics - , Sunday, March 22, 2009 at 5:59am

    PE=final KE
    Means that the change in potential energy of the masses has to equal the final gain of kinetic energy of the masses.
    On the second question, the formula is right, however, not having the figure, I have no idea what the h is. You need to go back to my original assumptions about the figure was, and see if that matches the figure. I am not a mindreader.

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