How do we know there is no horizontal acceleration? (projectiles)

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jojo55
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Howdy , could someone give an explanation for part c. I've highlighted it.

I just don't understand how we know there is no horizontal acceleration.

Thanks

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mqb2766
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#2
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There are no horizontal forces, so no horizontal acceleration.
The only force is gravity which acts vertically and so is independent from horizontal motion.
Last edited by mqb2766; 4 weeks ago
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jojo55
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#3
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(Original post by mqb2766)
There are no horizontal forces, so no horizontal acceleration.
The only force is gravity which acts vertically and so is independent from horizontal motion.
Thank you.
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