A block of mass m hangs from a string attached to a ceiling, as shown in Figure 5-16. An i...

A block of mass m hangs from a string attached to a ceiling, as shown in Figure 5-16. An identical string hangs down from the bottom of the block. Which string breaks if (a) the lower string is pulled with a slowly increasing force or (b) the lower string is jerked rapidly downward? Explain.

Figure 5-16