a moving electron accelerates at 5200m/s^2 in a 55.0 direction. After 0.350as, it has a velocity of 6598m/s in a - 20.5 direction. What is the y-component of the initial velocity?

-3802 m/s

Explanation:

The y-component of the final velocity is ...

(6598 m/s) ·sin (-20.5°) ≈ - 2310.7 m/s

The y-component of the velocity due to acceleration is ...

(5200 m/s²) (0.350 s) sin (55°) ≈ 1490.9 m/s

Then the initial velocity in the y-direction is found from ...

initial velocity + change in velocity = final velocity

initial velocity = (final velocity) - (change in velocity)

= - 2310.7 m/s - 1490.9 m/s ≈ - 3802 m/s