In a TV set, an electron beam moves with

Question

horizontal velocity of 4.5 × 10
7 m/s across the
cathode ray tube and strikes the screen, 48 cm
away.
The acceleration of gravity is 9.8 m/s
2
.
How far does the electron beam fall while
traversing this distance?
Answer in units of m

but how.

Answer 1

h=1/2 g t^2 where t=distance/velocity