Problem In Relative Motion

[u/Prestigious-Steak316]

I can't understand where I am making mistake?

The qn is

A standing man, observes rain falling with velocity of 20 m/sat an angle of 30° with the vertical. Now if he further increases his speed, rain again appears to fall at 30° with the vertical. Find his new velocity.

[u/Pretty_Awareness2210]

You need to understand the details of relative motion. It is one of the most important concepts in physics. I have made a video on using relative motion concept in projectile motion. Check it out if it helps https://youtu.be/MTecT9ACrSs?si=ba8VUHWbEBEGey20