In case you've forgotten the scene...
https://youtu.be/QhePJCracho?t=2296
Link to fast forward to scene^
Where's the physics?
From this scene, we can determine that Kevin demonstrates projectile motion when he launches himself into the air at a certain degree in order to cannonball effectively into the pool. We can assume the angle of his jump being 50 degrees and the length of his jump as 2 metres, with the jump lasting 1 second long. With this information we can find the depth of the pool he jumps into in metres.
Finding the depth of the pool:
x stuff:
△dx = 2m
△dx = 2m
vx = 1Cos50 = 0.64m/s
t = 1s
y stuff:
vy1 = 1Sin50 = 0.77m/s
a = -9.8 m/s^2
t = 1s
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