distance the car traveled during this time interval. (d) Determine the total stopping distance.
a)
18 m
b)
4.5 s
c)
40.5 m
d)
58.5 m
2)
The fuel in a bottle rocket burns for 2.0 s. While burning, the rocket moves upward with an
acceleration of 30 m/s
2
.
Assume the rocket starts from rest…
(a) What is the vertical distance the rocket travels while the fuel is still burning and how fast has it
traveling at the end of the burn?
60 m, 60 m/s
(b) After the fuel stops burning, the rocket continues upward but now in freefall. Estimate the maximum
height that the rocket reaches.
How long does it take to reach maximum height?
243.67 m, 8.12 s
MULTIOBJECT PROBLEMS
:
3)
A red car, initially at rest, travels east with an acceleration of 3.5m/s
2
.
At the same time as the red
car starts to move, a blue car is traveling west at 15m/s and accelerating at 1.2m/s
2
.
If they are 600m
apart the moment the red car starts to move and they are traveling towards each other, where and when
will they meet?
13.1s, 300.32m east of the red car’s initial position
.
(I totally made up these numbers
and they basically met in the middle!
Crazy!)
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A speeder passes a parked police car at 30.0 m/s.
The police car starts from rest, the moment the
speeder passes, and accelerates at 2.44 m/s
2
.
a)
How much time passes before the speeder is overtaken by the police car?
24.59s
b)
How far does the speeder get before being overtaken by the police car?
737.7 m
c)
What would a pt, vt, and at graph look like for this story?
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 Fall '11
 Hill
 pH, Velocity, Car, police car, 18 m, 15m/s, straight forward problems

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