Answer:
light is an example of a wave that is not mechanical .
it is different as it does not need material medium for its propagation
The eaths radius is the correct answer, if you need proof look at nasa's website

Actually Welcome to the Concept of the Projectile Motion.
Since, here given that, vertical velocity= 50m/s
we know that u*sin(theta) = vertical velocity
so the time taken to reach the maximum height or the time of Ascent is equal to
T = Usin(theta) ÷ g, here g = 9.8 m/s^2
so we get as,
T = 50/9.8
T = 5.10 seconds
thus the time taken to reach max height is 5.10 seconds.
P = IV
I = P/V = 30 / 120 = 0.25 A.
Current = 0.25A