Question

ping pong ball calculation
draw
given t = 00.51 vo = 0m/s δy = 1.20m
unknown vf
equations
substitute/solve

Explanation:

Step1: Identify the correct kinematic - equation

The kinematic equation for final velocity $v_f$ when initial velocity $v_0 = 0$, acceleration $a = g=9.8m/s^2$ and displacement $\Delta y$ is given is $v_f^2=v_0^2 + 2a\Delta y$.

Step2: Substitute the given values

We know that $v_0 = 0m/s$, $a = 9.8m/s^2$ and $\Delta y=1.20m$. Substituting into the equation $v_f^2=v_0^2 + 2a\Delta y$, we get $v_f^2=0^2+2\times9.8\times1.20$.

Step3: Calculate $v_f$

First, calculate $2\times9.8\times1.20 = 23.52$. Then, $v_f=\sqrt{23.52}\approx4.85m/s$.

Answer:

$4.85m/s$