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Direction Tests

Question : 25 of 38

Marks: +1, -0

Solution:

Concept:

Track the net displacement by resolving each movement into coordinates.

Explanation:

Assume start at

(0,0)

facing north.

First, walk 10 m front (north):

(0,10)

Then turn right (east), walk 10 m:

(10,10)

Now turn left (north), walk 5 m:

(10,15)

Turn left (west), walk 15 m:

(-5,15)

Turn left (south), walk 15 m:

(-5,0)

Final position is

(-5,0)

. Distance from start:

\sqrt{(-5)^2+0^2}=5

Answer:

5 metres

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