kinematics equations

In which of the following cases does a car have a negative velocity and a positive acceleration? A car that is traveling in the ……………

• –x direction and speeding up.

• +x direction and speeding up.

• –x direction and slowing down.

• +x direction and slowing down.

• a

• b

• c

• d

A stone is thrown vertically upward with a speed

of 15.5 m/sec from the edge of a cliff 75 m high.

What total distance did it travel?

• 12.26 m

• 62.74 m

• 87.26 m

• 99.52 m

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

A ball is dropped from rest from a height 6 m above the ground.

The ball falls freely and reaches the ground 1.1 seconds later.

What is the average speed of the ball?

• 6.1 m/sec

• 6.6 m/sec

• 5.5 m/sec

• 11 m/sec

Tags

NGSS.MS-PS3-1

A kingfisher is a bird that catches fish by plunging into water from a height of several meters .If a kingfisher dives from a height of 7 m with an average speed of 4 m/sec, how long does it take for it to reach the water?

• 6 sec

• 1.8 sec

• 9 sec

• 3.6 sec

Tags

NGSS.MS-PS3-1

A girl runs west at a constant speed of 3 m/sec for one minute and then runs east at the same speed for one minute .What is the magnitude of her average velocity over the entire two minutes?

• 360

• 180

• 60

• zero

• A

• B

• C

• D

What feature of motion is described by acceleration?

• The rate at which speed changes

• How quickly final velocity is reached

• The rate at which velocity changes.

• Whether motion is speeding up or slowing down