Projectile motion (part 8)
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10:34
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@DaleSparrow
Because the ball is in "free fall". From what i can recall, the ball is only being effected by the force of gravity in free fall, so it only has a vertical acceleration (g). It's horizontal acceleration is zero so it's horizontal velocity is also zero.
bronze83 1 year ago
Love Kahn's videos I learn a lot from them, and I may learn to shut my mouth here in a minute, (I'm in a rush and this is in haste) but the final result seems wrong to me:
Seems like the position function for this topic is:
-10 m/s^2 (t s)^2 + 25 m/s (t s) + 0
{x,y}:{ {5/2,0}, {5/4,125/8} }
h=125/8 vs 250/8
Kerpal2253 2 years ago
which means that it is technically stationary
megaelliott 2 years ago
yes the horizontal velocity is constant. It is constant at 0 in this example because the ball is only thrown straight up in the y direction.
megaelliott 2 years ago
hes only using Y velocity, don know why
DaleSparrow 2 years ago
hold on... doesn't the ball have a constant horizontal velocity, meaning that it isn't technically stationary at h??
singhboy3000 2 years ago
Thanks for this video.
Winsunn307 2 years ago