Acceleration, Velocity, and Time Calculations

A runner whose initial speed is 8 m/s increases her speed to 9 m/s in order to win a race. If the runner takes 5.0 s to complete this increase in speed, what is her acceleration?

• 0.2 m/s²

• -0.2 m/s²

• 5 m/s²

• -5 m/s²

A fighter jet lands on the flight deck of an aircraft carrier. The jet must reduce its speed from about 42.5 m/s to exactly 0 m/s in 2.0 s. What is the jet’s acceleration?

• 21.3 m/s²

• -21.3 m/s²

• 85 m/s²

• -85 m/s²

Tags

NGSS.MS-PS2-2

A bicyclist accelerates at 0.89 m/s² during a 5.0 s interval. What is the change in the speed of the bicyclist and the bicycle?

• 0.18 m/s

• 4.5 m/s

• 5.6 m/s

Tags

NGSS.MS-PS2-2

A freight train begins braking as it approaches a train yard. The train’s acceleration while braking is –0.33 m/s² . What is the change in the train’s speed after 23 s?

• -10.4 m/s

• 10.4 m/s

• 7.6 m/s

• -7.6 m/s

Tags

NGSS.MS-PS2-2

A child sleds down a steep, snow-covered hill with an acceleration of 2.82 m/s² . If her initial speed is 0.0 m/s and her final speed is 15.5 m/s, how long does it take her to travel from the top of the hill to the bottom?

• 5.5 s

• 0.19 s

• 42 s

• 8 s

Tags

NGSS.HS-PS2-1

The “street” automobile with the greatest acceleration is the Tempest. It has an acceleration of 6.89 m/s² . Suppose the car accelerates from rest to a final speed of 27 m/s. How long does it take the Tempest to reach this speed?

• 3.9 s

• 0.25 s

• 186 s

• 8.1 s

Tags

NGSS.HS-PS2-1

A certain type of rocket sled is used to measure the effects of sudden, extreme deceleration.

What is the acceleration of the sled reaches when its velocity changes from 90 m/s and then comes to a complete stop in 0.18 s.

• 500 m/s²

• -500 m/s²

• 16.2 m/s²

• -16.2 m/s²

Tags

NGSS.HS-PS2-1

A dog runs on a waxed floor at an initial speed of 1.5 m/s. It slides to a stop with an acceleration of –0.35 m/s² . How long does it take for the dog to stop?

• 3.3 s

• 0.53 s

• 0.23 s

• 4.3 s

Tags

NGSS.HS-PS2-1

The fastest elevators in the world accelerate upwards at 3.125 m/s². What is the change in speed of this elevator during a 4 second interval?

• 1.28 m/s

• 0.78 m/s

• 12.5 m/s

• 7.7 m/s

Tags

NGSS.HS-PS2-1