A pendulum bob is released from rest at a height of 44.1 m above the lowest point of its swing. Ignoring air resistance and taking m/s, what is its speed at the lowest point?

Answer and explanation

Correct answer: C. 29.4 m/s

  1. Step 1: Energy conservation: , so .
  2. Step 2: m/s.
Answer
29.4 m/s.
Why not the others: 864.36 m/s: the square root is missing. 20.789 m/s: the factor 2 in is missing. 432.18 m/s: it multiplies and without using energy conservation.

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A pendulum bob is released from rest… | EJU Japan Mechanics