Recent content by Paincake

I've seen online a kinematic equation for final velocity, which is Vf² = Vi² + 2(a)(d), but my teacher has not introduced it. Where does this equation come from? EDIT: Nevermind, I see it now. I solved for t using vf = vi + at --> (vf-vi)/a = t And I know distance = v*t and average velocity...

Homework Statement "A body is thrown downward with an initial speed of 20 m/s on Earth. What is the time required to fall 300 m?" I tried finding kinetic and gravitational energy, but then I realized I don't have any mass to use it with (1/2)*m*v^2 and m*g*h How can I solve this problem...