Acceleration Review

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

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

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

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

Acceleration only takes place when things speed up. 

• True
• False

In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.
• A car approaching a red light
• A car with the cruise control set at 80 km/h
• A car turning a curve at a constant speed

Determine the motion of the car.

• at rest 
• moving at constant speed
• speeding up
• slowing down

Determine the motion of the car.

• at rest 
• constant velocity 
• speeding up
• slowing down

If a motorboat spends 5.0 s going from moving forward at 12 m/s to moving forward at 18 m/s, how far did it go?

• 60 m

• 75 m

• 90 m

• 30 m

• 150 m

Answer explanation

If a battery-powered car can accelerate at 14.0 m/s², how fast will it be going after 3.2 s if it started from 0.0 m/s?

• 4.375 m/s

• 10.8 m/s

• 14.0 m/s

• 44.8 m/s

The unit for Acceleration is usually

• m/s

• m/s²

• m

• s