Question

a string of lenght L=120cm has a ball attached to one end and is fixed at its other end. when the initially stationary ball is released from the horizontal, what is the speed it reaches when it comes to its lowest point.

Answer 1

Let:

$$L = 120 \text{ cm} = 0,12 \text{m}$$ $$v = ?$$

The ball moving is free fall,

$$v = \sqrt{2gL}$$

Enter the data:

$$v = \sqrt{2 \times 9.8 \times 0.12} = 2.352 \text{ m/s}$$

Answer: 2.352 m/s.