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Newton's 2nd law

  • Thread starter gxinxing
  • Start date
  • #1
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Homework Statement


An arrow, starting from rest, leaves the bow with a speed of 25 m/s. If the average force exerted on the arrow would be doubled, all else remains the same, with what speed would the arrow leave the bow?

Homework Equations


force = mass x acceleration


The Attempt at a Solution


Since the mass is constant, I assumed that there's a direct relationship between force and acceleration (in this case, speed, since I believe time is irrelevant) so a doubled force should have resulted in doubled acceleration (50 m/s/time). But the answer is 35.4. Why is that?
 

Answers and Replies

  • #2
ehild
Homework Helper
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The acceleration is doubled, but the speed was asked.

ehild
 
  • #3
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How do I figure out the speed without a given time?
 

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