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

Answer 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

Answer 2

ya thts rt . so h will be 0.187m

Answer 3

yes