physics - energy question

A simple pendulum, 2.0 m in length, is released with a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2). i don't knw where to start plzz help me

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  1. KEinitial+ PEinitial=KEbottom

    So the idea is to use geometry to find the initial height of the bob.

    Would h= 2.0(1-cos25) ? check my thinking

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    bobpursley
  2. ya thts rt . so h will be 0.187m

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  3. yes

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