Question

A boat travels 12 m [45° N of E] and then 18 m [N]. The displacement of the boat is

a) 30 m [45° N of E]
b) 25 m [45° N of E]
c) 15 m [72° N of E]
d) 28 m [72° N of E]

Please answer and explain!

Answer 1

Answer:

(d)28 m [72° N of E]

Explanation:

This question can be solved but in exam for time purpose you can reject the choices so it can be easily solved

First of all the displacement will be resultant to the vector in north-east direction and north direction. Thus angle formed will be greater than initial angle formed.Thus answer must be 3 or 4

Then we can guess that the resultant is an hypotenuse side of a triangle thus the length must be more than that of other two

Hence option 3 is eliminated

Thus answer will be 4