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