Question

2. Bianca stands on top of a tall building. She drops a 3 kg rock from rest. Ignoring air resistance, what will be the

velocity of the rock after 3 s?
A. -10 m/s
B. -30 m/s
-0.33 m/s
+10m/s

Answer 1

v=-30 m/s

Step-by-step explanation:

Using the equation:

v=u+at

v=?

u means initial velocity=0

a=-10 since it is going down we make the acceleration due to gravity negative

t=3

v=0+(-10)(3)

v=-30 m/s