Acceleration is the time-rate change in

1.   ?    velocity
2.   ?    displacement
3.   ?    speed
4.   ?    distance

Which is a scalar quantity?

1.   ?    acceleration
2.   ?    displacement
3.   ?    force
4.   ?    distance

A runner completed the 100.-meter dash in 10.0 seconds. Her average speed was

1.   ?    1,000. m/s
2.   ?    0.100 m/s
3.   ?    10.0 m/s
4.   ?    100.m/s

Which statement about the movement of an object with zero acceleration is true?

1.   ?    The object may be slowing down
2.   ?    The object may be in motion
3.   ?    The object must be at rest
4.   ?    The object may be speeding up

A car moving at a speed of 8.0 meters per second enters a highway and accelerates at 3.0 meters per second**2. How fast will the car be moving after it has accelerated for 56 meters?

1.   ?    20. m/s
2.   ?    4.0 m/s
3.   ?    24 m/s
4.   ?    18 m/s

The velocity of a car changes from 60. meters per second north to 45 meters per second north in 5.0 seconds. The magnitude of the car's acceleration is

1.   ?    9.8 m/s**2
2.   ?    53 m/s**2
3.   ?    15 m/s**2
4.   ?    3.0 m/s**2

Which two terms represent a vector quantity and the scalar quantity of the vector's magnitude, respectively?

1.   ?    displacement and distance
2.   ?    acceleration and velocity
3.   ?    speed and time
4.   ?    weight and force

A baseball pitcher throws a fastball at 21 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter?

1.   ?     3.8 seconds
2.   ?    4.6 seconds
3.   ?    1.72 seconds
4.   ?    .86 seconds