Acceleration

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

Acceleration is defined as the CHANGE in 

• time it takes for one place to move to another place. 
• velocity of an object.
• distance divided by the time interval 
• velocity divided by the time interval 

Acceleration only takes place when things speed up. 

• True
• False

A roller coasters speeds up from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  Calculate the acceleration.

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

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

A drag racer accelerated from 0 m/s to 200 m/s in 5 s.  What was the acceleration?

• 0 m/s
• 40 m/s²
• -40 m/s²
• 40 m/s

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

Mark slams on the brakes after traveling 25 m/s. It takes him 3 seconds to come to a complete stop. What is his acceleration?

• 8.33 m/s²

• -8.33 m/s²

• 75 m/s²

• -75 m/s²

How much time did it take Matthew to slow down to a complete stop, after traveling at 30 m/s. His acceleration is -12 m/s²

• 2.5 s

• 360 s

• .4 s

• -2.5 s

If Anthony was running for 300 s after starting at rest, what was his final velocity if he had an acceleration of 0.05 m/s²

• .25 m/s

• .01 m/s

• 100 m/s

• 15 m/s