Grigori
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Displacement is defined as the shortest distance between a particle's initial and final positions.


Step 1:  Calculating the magnitude of the displacement

Given that

Radius of the circular ice ground r = 200 m

Girls began skating at point P and moved to point B.

Magnitude of the displacement for each girl is equal to the diameter of the circular ice ground since it is the shortest distance between P and Q

Diameter of the circular ice ground = 2* Radius of the circular ice ground

D = 2 * 200

D = 400 m

Hence, magnitude of the displacement for each girl D = 400 m

Step 2: Find the girl who travelled through the actual displacement

Magnitude of the displacement is the exact length of the route that girl B skated.