physics

m1 = 2.3 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 45 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended.
What is the speed of block m2 when the extension is 65 cm?

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  1. do potential and kinetic energy
    k = 45
    g = 9.81
    x = 0.65 max
    Pe = Ke = 0 at start
    Pe = (1/2) 45 (.65)^2 - 3.6 (9.81) (.65)
    Ke = (1/2)(2.3+3.6) v^2
    the sum is zero, solve for v (it could be + and it could be - :)

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