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Physics2A
Fall2015
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Lab: early late (circleone)
Quiz #2: One DimensionalKinematics
Problem 1 (2 points)
You throw a ball straightup in the air. At the highestpoint, the ball's
I n
a)velocityandacceleration
arebothzero.
b) velocityis nonzero
butitsacceleration
iszero.
I
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r,, _q,to
aurgr^rdItrL
6ffittii.'J'oi*iouo.rerationisnonzero
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d) velocity and accelerationareboth nonzero.
19eh4'rt*
n/Sr, *vo+
Pord.
Problen 2 (3 points)
A boy walks655meterswestandthetr320mete$east.Thetrip takesa totalof9.13 minutes.(a)Wharis
theaverage
velocityoflhe boy?(b) Whatis thea.verage
speedofthe boy?
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AX=
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= b556 +3?On = 975r'r
At= 1,|V"^tn = 51'1.8s
( a) v"* = d x-- -- -132j-- _o,61Anfs
At
s1\.gs
u, \
lb ) an<.aVta
o'w--aa"^I=
probrem3(5points)
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=@'4
A carstartsfromrestandaccelerates
to therightwith a constantacceleration
After 3.0r, tfi;;ffi'traveled35.0m. (a) Whatis theacceleration
of thecar?(b) Whatis thecar'svelocityatt : 3.0s?
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t,l
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t
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t^
(z -o s)^
V = Vu l-a.t
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4
av l l_ - ?
f = 3.os
v=
(t .t t*/s") ( z . os)
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