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21
Old Exam . Questions Ch.2
T072
Q2
.The position of an object is given as a function of time by
23
4.0
3.0
xt
t
=−
, where
x
is in meters and
t
is in seconds. Its average
acceleration during the interval from
t
= 1.0 s to
t
= 2.0 s is:(Ans:
−
19 m/s
2
)
Q3.:
A car starts from rest and undergoes a constant acceleration. It travels 5.0 m
in the time interval from t = 0 to t = 1.0 s. Find the displacement of the car during
the time interval from t = 1.0 s to t = 2.0 s.( Ans: 15 m)
Q4
. Fig. 1 represents the velocity of a car (v) moving
on a straight line as a function of time (t). Find the
acceleration of the car at 6.0 s. (A ns: 3.0 m/s
2
)
T071 :
Q3
.Fig 1 shows the positiontime graph of an object.
What is the average velocity of the object between
t=0.0 s and t= 5.0 s? (Ans: 2.0 m/s)
Q4.
Fig 2 shows a velocitytime graph of a
runner. If the runner starts from the origin, find
his position at t = 4.0 s.( Ans: 45 m)
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Q5.
An object is thrown vertically upward with an initial speed of 25 m/s
from the ground. What is the height of the object 1.0 s before it touches
ground? (Ans:20 m)
Q6
. A car starts from rest and accelerates at a rate of 2.0 m/s
2
in a straight
line until it reaches a speed of 20 m/s. The car then slows down at a
constant rate of 1.0 m/s
2
until it stops. How much time elapses (total time)
from start to stop? (Ans: 30 s)
T062
Q3:
A car travels along a straight line at a constant velocity of 18
m/s
for 2.0
s
and then accelerate at
−
6.0
m/s
2
for a period of 3.0
s
. The average velocity of
the car during the whole 5.0
s
is: (Ans: 13 m/s)
Q4.
The velocity as a function of time for a particle
moving along the
x
axis is shown in Fig.1. The
motion clearly has two different parts: the first part is
from
t
= 0 to t = 2.0
s
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 Spring '08
 ERSKINE/TSOI

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