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Q1 (CISF/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology)

A person starts from a point P and walks 1 km along a straight line and then turns to his right and walks straight for 2 km. After that, he turns to his left and walks for 3 km to reach a point Q. What is the straight line distance of the point Q from the point P ?

Explanation

To find the straight-line distance between point P and point Q, we use the Pythagorean theorem by calculating the net displacement in two perpendicular directions. Let point P be the starting coordinate (0, 0).

  • Movement 1: Walk 1 km straight (e.g., North) to reach (0, 1).
  • Movement 2: Turn right (East) and walk 2 km to reach (2, 1).
  • Movement 3: Turn left (North) and walk 3 km to reach (2, 1 + 3) = (2,
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