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## Homework Statement

A pole-vaulter leaves the ground with an upward speed of 9.5 m/s.

(a) How fast is she going when she is 2.0 m above the launch point?

(b) How long is required to reach this height?

(c) Why are there two answers to (b)?

## The Attempt at a Solution

Question A and B I don't have a problem with. I worked out A to be 7.1 m/s (2 sig digs) and B to be 0.2 seconds (2 sig digs).

However it is question C I am not understanding. I feel tempted to write "because I can write the answer in seconds or I can write it in minutes". But I feel this is a silly answer, therefore I need help.