Basic physics

  • Thread starter chengbin
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  • #1
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Homework Statement



A puck of mass 30g slides across rough ice, experiencing a frictional force of 0.2N. If it was moving at 10km/h when it hit the ice patch, how long did it take to stop? How long was the ice patch?

Homework Equations





The Attempt at a Solution



I don't think this question is solvable or make any sense. If it hits something, it stops instantly, but the answers say 0.42 seconds.
 

Answers and Replies

  • #2
tiny-tim
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Hi chengbin! :smile:

This is colloquial English …

"hit" (here) means "reach" … it reaches the ice patch, and is slowed down while crossing it. :wink:

(see http://en.wikipedia.org/wiki/Colloquialism" [Broken])
 
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  • #3
26
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Hi chengbin! :smile:

This is colloquial English …

"hit" (here) means "reach" … it reaches the ice patch, and is slowed down while crossing it. :wink:

(see http://en.wikipedia.org/wiki/Colloquialism" [Broken])
Thank you!

That solved the problem.
 
Last edited by a moderator:

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