Question

A phone with a mass of 0.2 kg is dropped from a height of 30 m what is it’s speed when it hits the ground?the acceleration of gravity is 9.8ms

Answer 1

24.2 m/s

Step-by-step explanation:

Mass is irrelevant in this situation....

Displacement: ( to find time)

x = xo + vo t - 1/2 at^2

30= 0 + 0 - 1/2 (9.8)t^2

t = 2.47 seconds

Velocity:

vf = a t = 9.8 (2.473) = 24.2 m/s