#### Description

The above simulation shows disturbances on two identical strings (position is in
centimeters and time is in seconds).

#### Question

At t=2.5 seconds which of the following is true
regarding the superposition of the two waves? Start

**Their sum adds up to zero.**
**Their sum adds up to twice the original waves.**
**Their sum is as if only one of the original waves is there.**
**Their sum has a peak, a depression, and then a trough.**

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