Question

A man walks 10 km 60 degree N of E, 10km 60 degree N of W, 10 km due east then takes fourth displacement to return to initial position then the fourth displacements is:-​

Answer 1

√(10)² cos60 + (10)² cos60 + (10)² cos60

= √50 + 50 + 50

= √150

= 5√6 km