Imagine a small child whose legs are half as long as her parent’s legs. If her parent can walk at maximum speed V, at what maximum speed can the child walk?

Explanation:

We know that speed is given by dividing distance by time or multiplying length and frequency. The speed of the father will be given by Lf where L is the length of the father’s leg ad f is the frequency.

We know that frequency of simple pendulum follows that

Now, the speed of the father will be while for the child the speed will be

The ratio of the father’s speed to the child’s speed will be

the bal will not change its velocity.