Acceleration

A ball of clay is thrown at a wall at a velocity of 28.0 m/s. After it hits the wall, it takes 0.020 s to stop. What is the acceleration of the clay when it hits the wall?

• 1400 m/s²

• -1400 m/s²

• 0.56 m/s²

• -0.56 m/s²

A box sliding down an inclined plane 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

Tags

NGSS.HS-PS2-1

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 

Tags

NGSS.HS-PS2-1

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

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

When are you undergoing an acceleration in a car? 

• speed up
• slow down
• make turns
• All of the above 

Tags

NGSS.HS-PS2-1

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

Tags

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

Tags

NGSS.HS-PS2-1

A car accelerates from 15 km/hr to 60 km/hr in 30 seconds. What is its acceleration?

• 6 km/hr/s

• 3 km/hr/s

• 1.5 km/hr/s

• 0.75 km/hr/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

Tags

NGSS.HS-PS2-1

Which of the following is a unit for acceleration?

• mi/hr/s

• mi/hr

• mi

• hr