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kinematics
1. An elevator is moving upward with a speed of 11 m/s. 3 seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration ?

2.0 m/s2 , downward
2.0 m/s2, upward
5.3 m/s2 , downward
5.3 m/s2, upward
2.7 m/s2, downward

2. A landing airplane makes contact with the runway with a speed of 78.0 ms and moves toward the south. After 18.5 s , the airplane comes to rest. What is the average acceleration ?

2.11 m/s2, north
2.11 m/s2, south
4.22 m/s2, north
4.22 m/s2, south
14.3 m/s2, north

3. which one of the following is not a vector ?

acceleration
average speed
displacement
average veloscity
instantaneous velocity

4. Which one of the following must be true if d = Vo (T) + 0.5 (a) (T**2)

d is constant
V is constant
t is constant
a is constant
both Vo and t are constant

5. A car, starting from rest, accelerates in a straight-line path at a constant rate of 2.5 m/s2. How far will the car travel in 12 seconds?

180 m
120 m
30 m
15 m
4.8 m

6. A car starts from rest and accelerates at a constant rate in a straight line. In the first second the car convers a distance of 2.0 meters. How fast will the car be moving at the end of the "second "second ?

4.0 m/s
16 m/s
2.0 m/s
32 m/s
8 m/s

7. A car initially travels ar 50.0 km/h. The brakes are applied and the car stops over a distance of 35m. What was the magnitude of the car's acceleration while it was braking. !! conversion ahead...

2.8 m/s2
5.4 m/s2
36 m/s2
71 m/s2
9.8 m/s2

8. A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. After traeling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating.

1.5 m/s
7.0 m/s
34 m/s
49 m/s
2.3 m/s

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