Question

A rock falls off a cliff and hits the ground after three seconds. What is its velocity right before it hits the ground? 9.8 m/s 0.31 m/s 29.4 m/s 3.3 m/s

Answer 1

Vf = Vi + at 
Vf = 0 + (9.81 m/s^2)(3 seconds) 
Vf = 29.43 m/s and or about 29.4 m/s 

Answer 2

9.8 m/s

I'm not sure but I think this is the correct answer