$$v^2 = u^2 + 2*a*s$$
The final velocity $$v$$, the initial velocity $$u$$, the acceleration $$a$$ and the displacement $$s$$ satisfy this equation.
Imagine that you throw a ball up in the air. The ball leaves your hand with a speed of $$10 \, \mathrm{m/s}$$. It goes up to a maximum height of $$5 \, \mathrm{m}$$. Which of the following would you use to determine the acceleration it experienced when it travelled upwards?
• 3rd EOM with $$v = 10 \, \mathrm{m/s}$$ and $$s = 5 \, \mathrm{m}$$
• 3rd EOM with $$u = 10 \, \mathrm{m/s}$$ and $$s = -5 \, \mathrm{m}$$
• 3rd EOM with $$u = 10 \, \mathrm{m/s}$$ and $$s = 5 \, \mathrm{m}$$
• 3rd EOM with $$v = 10 \, \mathrm{m/s}$$ and $$s = -5 \, \mathrm{m}$$