anonymous
  • anonymous
A student tosses a 2 kg ball into the air 4 meters above his hand. Ignoring air friction, what will be the magnitude of the velocity of the ball when it returns to his hand? A 1 m/s B 2 m/s C 8 m/s D 10 m/s
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
\[v _{f}^{2}=v _{i}^{2}+2a \Delta x\]
anonymous
  • anonymous
but you dont have any velocity
anonymous
  • anonymous
hmm but actually I'm getting 8.85 as my answer

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More answers

anonymous
  • anonymous
would vf be 0?
anonymous
  • anonymous
mgh=0.5mv^2
anonymous
  • anonymous
potential energy = kinetic energy
anonymous
  • anonymous
hmm ill try both equations!
anonymous
  • anonymous
ans= 8.85
anonymous
  • anonymous
they give the same answer so I think something is missing.
anonymous
  • anonymous
wait so it doesnt matter which equation?
anonymous
  • anonymous
no both give the same result.
anonymous
  • anonymous
but Im not sure if the answer is correct since 9 isn't listed.
anonymous
  • anonymous
okay would vf = 0 in @VeritasVosLiberabit
anonymous
  • anonymous
vi = 0 you are trying to find vf
anonymous
  • anonymous
the answer is supposed to be 8 so i guess thats close right?
anonymous
  • anonymous
oh hah yeah my bad
anonymous
  • anonymous
hmm but you dont round downward
anonymous
  • anonymous
if it asks for 1 sigfig the answer should be 9.
anonymous
  • anonymous
yeah im a little iffy about that but i can try asking my teacher that one tomorrow morning!
anonymous
  • anonymous
either way the question might be wrong taking g= 9.81... my best answer could be 10 :)
anonymous
  • anonymous
thanks you guys! ill ask my teacher to verify it
anonymous
  • anonymous
you're welcome.

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