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A man walks 8km north and then 5km in a direction 60o east of north....

Physics
JAMB 1987
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
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Correct Answer: Option A
Explanation
R = \(\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}\)

R = \(\sqrt{129}\)

= 11.36km
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