A rock is tossed straight up with a velocity of +20m When it returns, it falls into a hole 10m deep.(adsbygoogle = window.adsbygoogle || []).push({});

What is the rock's velocity as it hits the bottom of the hole?

So basically it is asking for the impact speed right?

So that would be

Vf^2=Vi^2 +2adelta(s)

Vf^2=0+2*9.8*30.41

Vf^2=24.41

It says it is wrong. I know 30.41 is the right amount of the total meters in the fall since I solve another part and got the answer right. So that means that the kinematic equation is wrong so which would it be?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Free Fall (kinematics-what I do wrong?)

**Physics Forums | Science Articles, Homework Help, Discussion**