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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
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\[v _{f}^{2}=v _{i}^{2}+2a \Delta x\]
but you dont have any velocity
hmm but actually I'm getting 8.85 as my answer

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Other answers:

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

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