Question

If a person walks 10km north and 20km east then the resultant displacement is?
Options are =a. 22.36km
b. 22.46km
c. 25.23km
d. 20.36km

Answer 1

Answer:

a) 22.36  

Explanation:

The person walks in the shape of a rectangle where the shorter side is 10 Km and the longer side is 20 Km

Therefore the displacement will be the diagonal of the rectangle

Given:

l = 20 Km

b= 10 Km

Diagonal of the rectangle will be equal to

√(20)^2 + (10)^2 = √500             ( By pythagoreas Theorem)

                           = 10√5

                           = 22.36 Km