A man walks 8km north and then 5km in a direction 60o east of north. Find the distance from his starting point
A
11.36km
B
12.36km
C
13.00km
D
14.36km
Verified Correct Answer: A.
Physical Principles & Numerical Solution
R = \(\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}\)
R = \(\sqrt{129}\)
= 11.36km
Source: Myschool Past Questions Archive (Record #28402)