Rev G 8

A race car goes from 100 m/s to rest in 25 seconds. What is its acceleration?

• -5 m/s²
• .4 m/s
• -0.25 m/s²
• -4 m/s²

A roller coasters accelerates from an initial velocity 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

A ball takes 5 seconds to roll up a slanted hill. It starts with a velocity of 2.5 m/s up the hill and is moving at 0.5 m/s when it reaches the top of the hill. What is the average acceleration?

• 5 m/s²
• 0.4 m/s²
• -0.4 m/s²
• -1 m/s²

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

Why does a car accelerate as it turns around a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

Acceleration of an object happens when things ________

• slow down
• go faster
• change direction (turn)
• All of the above

How can acceleration be zero?

• a car runs out of gas and slowly rolls to a stop
• a car decreases speed at a constant rate until it comes to rest
• car has constant speed and is traveling on a straight path
• the car travels round trip and is back at the starting point

A box sliding down a hill attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s
• 24 m/s²
• 9 m/s²
• 81 km/hr

Acceleration only takes place when things speed up. 

• True
• False

Which of the following is accelerating?

• A cannonball sitting on the ground
• A boat traveling at a constant speed in a straight line
• A can being crushed under a person's foot
• A car going around a curve at a constant speed