(Reflection of pulse from a free boundry is really the supperposition of two
identical waves travelling in opposite direction. This can be shown as under.
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/16099758589073443581609975858.png)
,
In every 1/2s, each pulse (one real moving towards right and one imaginary moving towards left) travels a distance of 1cm as the wave speed is 2 cm/s.
(b) Particle speed, `v_p = |-v(slope)|`
Here, v=wave speed =2cm/s
and slope =1/2
`:. "Particle speed" = 1cm/s` .