Two cars, A and B, are traveling at the same speed and hit the brakes at the sam

Question

Two cars, A and B, are traveling at the same speed and hit the brakes at the same time. Car A
has double the deceleration of Car B. By what factor does the time required to stop Car A
compare with that for Car B?
A) Car A takes half as long to stop.
B) Car A takes one quarter as long to stop.
C) Car A takes twice as long to stop.
D) Car A takes four times as long to stop.
6. Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and
undergo identical decelerations. How does the distance required for car A to stop compare
with that for car B?
A) Car A takes half the distance to stop.
B) Car A takes one quarter the distance to stop.
C) Car A takes twice the distance to stop.
D) Car A takes four times the distance to stop.
7. Suppose that an object is moving with a constant velocity. Make a statement concerning its
acceleration.
A) The acceleration must be constantly increasing.
B) The acceleration must be constantly decreasing.
C) The acceleration must be a constant non-zero value.
D) The acceleration must be equal to zero.
8. Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both
objects continue to fall, their separation
A) increases.
B) decreases.
C) stays constant.
D) increases at first, but then stays constant.
E) decreases at first, but then stays constant.
9. Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a
speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?
A) 100 s
B) 50 s
C) 25 s
D) 20 s
E) 10 s
10. A car starts from rest and accelerates at 6.00 m/s2. How far does it travel in 3.00 s?
A) 9.00 m
B) 18.0 m
C) 27.0 m
D) 36.0 m
E) 54.0 m
11. A car is making a 12-mile trip. It travels the first 6.0 miles at 30 miles per hour and the last
6.0 miles at 60 miles per hour. What is the car's average speed for the entire trip?
A) 20 mph
B) 35 mph
C) 40 mph
D) 45 mph
E) 50 mph

Explanation / Answer

5.A) Car A takes half as long to stop. 6. D) Car A takes four times the distance to stop. 7.D) The acceleration must be equal to zero. 8. C) stays constant 9.D) 20sec 10.C) 27 m 11. d) 45mi/h

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