Acceleration

Velocity is both ____ and _____. 

• speed , direction 
• direction, mass
• volume, density 
• direction, magnitude 

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

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

Acceleration: is the ___________.

• rate of change of velocity
• rate of change of speed

• rate of change of displacement

• rate of change of mass

In science, acceleration refers to... Select all that apply.

• increasing speed

• decreasing speed

• changing direction

• increasing speed only

What does it mean when a change in velocity(acceleration) is negative?

• The object is speeding up.

• The object is slowing down.

• The object is changing direction.

• The object is falling down.

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

If velocity is measured in meters/second and time is measured in seconds, the unit of acceleration is ...SELECT ALL THAT APPLY

• m/s/s

• m/s²

• m/s

• m

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

What is the final velocity of a rocket that travels for 4 seconds, has an initial velocity of 12 km/s and an acceleration of 2 km/s²?

• -4 km/s

• 10 km/s

• 20 km/s

• -10 km/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