Projectile Motion Neglecting air resistance

AI Thread Summary
To determine the speed of a ball thrown straight up at 20 m/s when caught, it's essential to apply the principles of projectile motion. The discussion highlights confusion over whether to calculate speed or distance, with emphasis on the need for relevant equations. The original poster acknowledges a typographical error in their question but is urged to consider applicable physics equations for a complete analysis. The conversation underscores the importance of understanding motion dynamics in solving such problems. Proper application of equations will yield the correct speed upon catching the ball.
JenniferT
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Homework Statement


Neglecting air resistance, if you throw a ball straight up with a speed of 20 m/s, how far will it be moving when you catch it?

Homework Equations


None

The Attempt at a Solution

 
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Do you mean how fast will it be moving when you catch it?

Are you sure there are no relevant equations to help you solve this problem? Did you give up while writing this post?
 
SteamKing said:
Do you mean how fast will it be moving when you catch it?

Are you sure there are no relevant equations to help you solve this problem? Did you give up while writing this post?
I did mean how fast. Please excuse my typing error.
 
Still, the larger, unresolved issue is, are you sure there are no relevant equations you can apply to analyzing this problem?
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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