Quadratics: Identify Effect of Gravity, Initial Velocity &Height

Effect of Gravity (depends on perspective: there are two possible answers)

You drop a ball from a 400 foot tall building. From your perspective how far does the ball drop after 2 seconds? Think about which effect of gravity you need to use. $$16t^{2\ }or\ -16t^2$$ ?

You drop a ball from a 400 foot tall building. From the perspective of someone on the ground, how far away is the ball from them after 2 seconds?

What is the initial velocity of $$500+60x-16x^2$$

What is the effect of gravity of $$500+60x-16x^2$$

What is the initial height of $$500+60x-16x^2$$

What is the initial height of $$345+25x-16x^2$$

What is the effect of gravity of $$345+25x-16x^2$$

What is the initial velocity of $$345+25x-16x^2$$

Match the following $$-16x^2+40x+5000$$