Question

Raindrops make an angle q with the vertical when viewed through a moving train window (Fig. 3-48). If the speed of the train is vt , what is the speed of the raindrops vd in the reference frame of the Earth in which they are assumed to fall vertically?

Answer 1

\[ \tan q = \frac{v_d}{v_t}\]
Therefore, the velocity of the raindrop in the frame of the earth is
\[ v_d = v_t \tan q \] in the negative y direction

Follow? :)

Answer 2

~~The only translation velocity in the **frame** of the train...

Answer 3

Thank you so much and yes this makes perfect sense!