Versus time being sure to show all three time

versus time, being sure to show all three time intervals. (b) What is its velocity after the 3.0 s of braking? (c)
What was its displacement during the total 14.0 s of its motion? (d) What was its average speed for the 14.0
s?
6

Full file at
53.  A train normally travels at a uniform speed of
72 km h
on a long stretch of straight, level track. On a
particular day, the train must make a 2.0-min stop at a station along this track. If the train decelerates at a
uniform rate of
2
1.0 m s and, after the stop, accelerates at a rate of
2
0.50 m s , how much time is lost
54. MC For a constant linear acceleration, the velocity-versus-time graph is (a) a horizontal line, (b) a vertical
line, (c) a nonhorizontal and nonvertical straight line, (d) a curved line.
55. MC For a constant linear acceleration, the position-versus-time graph would be (a) a horizontal line, (b) a
vertical line, (c) a nonhorizontal and nonvertical straight line, (d) a curve.
56. MC An object accelerates uniformly from rest for t seconds. The object’s average speed for this time interval
is (a)
2
, at
(b)
1
57. CQ If an object’s velocity-versus-time graph is a horizontal line, what can you say about the object’s
58. CQ In solving a kinematic equation for x , which has a negative acceleration, is x not
59. CQ
60. CQ A classmate states that a negative acceleration always means that a moving object is decelerating. Is this
v 
61.  At a sports-car rally, a car starting from rest accelerates uniformly at a rate of 2
9.0 m s
over a straight-line
distance of 100 m. The time to beat in this event is 4.5 s. Does the driver do it? If not, what must the
62.  A car accelerates from rest at a constant rate of
2
2.0 m s for 5.0 s. (a) What is the speed of the car at the
end of that time? (b) How far does the car travel in this time?
7

Full file at
63.  A car traveling at
25 mi h
is to stop on a 35-m-long shoulder of the road. (a) What is the required
magnitude of the minimum acceleration? (b) How much time will elapse during this minimum deceleration
until the car stops?