Acceleration and Deceleration

A car travels 100km. The journey takes two hours. The highest speed of the car is 80km/ h, and the lowest speed is 40km/ h. What is the average speed for the journey?

• 40km/ h

• 50km/ h

• 60km/ h

• 120km/ h

An object is moving with uniform deceleration. Which statement describes its motion?

• Its rate of change of speed is decreasing.

• Its speed is constant.

• Its speed is decreasing.

• Its speed is increasing.

The velocity of an object increases from 30 m / s to 50 m / s in 5.0 seconds.

What is the average acceleration of the object?

• 0.10 m / s²

• 0.25 m / s²

• 4.0 m / s²

• 10 m / s²

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NGSS.HS-PS2-1

A car travels at an average speed of 60 km / h for 15 minutes. How far does the car travel in 15 minutes?

• 4.0 km

• 15 km

• 240 km

• 900 km

A car is travelling at a velocity of 2.0 m / s. It accelerates at a constant 0.20 m / s² for 2.5 minutes. What is the final velocity of the car?

• 2.5 m / s

• 5.2 m / s

• 30 m / s

• 32 m / s

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NGSS.HS-PS2-1

A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

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NGSS.HS-PS2-1

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.

• 2.2m/s²
• 7.0m/s²
• 5.7m/s²
• 70m/s²

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NGSS.HS-PS2-1

Units for acceleration is

• m/s

• m/s²

• m

• s

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A rocket started at rest. After initiating the launch, it had an acceleration of 90 m/s². How long did it take to reach a speed of 2430 m/s?

• 13.5 s

• 65610 s

• 27 s

• 32805 s

Tags

NGSS.HS-PS2-1

Acceleration in the opposite direction of motion means that your object is  

• constant

• speeding up

• at rest

• slowing down

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