Vector of magnitude 15 is added to a vector of magnitude 25. The magnitude of this sum might be:

A. Zero
B.5
C.9
0 15
E.4
and how ?

Explanation:

Given that,

Magnitude of vector A, |A| = 15

Magnitude of vector B, |B| = 25

We need to find the magnitude of this sum.

The maximum sum of the resultant vector,

The minimum sum of the resultant vector,

So, the magnitude of this sum either 45 or -10.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray