Question

A person walks 4 km, turns towards his left and walked 6 km, then tums to his right again and walked 4 km. The displacement from the starting
point is -
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Answer 1

Answer:

Explanation:

The ans is in the jpg file given below(10km)

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Answer 2

Given:

A person walks 4 km, turns towards his left and walked 6 km, then tums to his right again and walked 4 km.

To find:

The displacement of the object

Solution:

As from the figure you can see that the triangles formed are similar to each other.

And one of the sides of the triangle is 4 centimeters.

So by the similarity rule, the line DC must bisect the line AB

So the length of AE must be 3 cm

Now,

in any of the triangle using the Pythagoras theorem

ΔADE

AD²+AE² = DE²

• 4²+3² = DE²
• DE² = 16+9
• DE = √25
• DE = 5 cm

And the displacement is

• DC = 2DE
• DC = 2×5 cm
• DC  = 10 cm

So the displacement of the body is 10 cm