Acceleration and Free-Fall Practice

If a car's brakes can make it accelerate at -15 m/s², how fast was it going to start with if it takes 3.0 s to stop?

• 45 m/s

• 5.0 m/s

• 0.6 m/s

• 12 m/s

If a t-shirt in a t-shirt gun goes from rest to 32 m/s in 0.4 s, what acceleration does the t-shirt have?

• 12.8 m/s²

• 0.078 m/s²

• 8 m/s²

• 80 m/s²

If a rocket can continuously accelerate up from rest at 22 m/s², how long does it take for the rocket to climb 425 m?

• 19.3 s

• 6.2 s

• 38.6 s

• 425 s

If a cat jumps straight up at 30 m/s, where will the cat have positive acceleration?

• On the way up

• On the way down

• Neither on the way up nor on the way down

If a cat jumps straight up at 30 m/s, where will the cat have positive velocity?

• On the way up

• On the way down

• Neither on the way up nor on the way down

The idea that all objects, no matter their weight, accelerate the same when gravity is accelerating them, is only true if...

• ...the objects are released from rest.

• ...the objects are dropped from a high enough height.

• ...air resistance is ignored.

• ...the objects are released at the same time.

A baseball is thrown up into the air. What happens to the velocity as the ball rises in the air?

• the velocity increases

• the velocity decreases

• the velocity remains constant

Tags

NGSS.HS-PS2-1

Describe the speed of the rocket in the speed vs. time graph.

• Constant speed
• Decreasing speed
• Increasing speed
• Not moving

Tags

CCSS.HSF.IF.B.4

Describe the speed of the object from
2-5 seconds using the speed vs. time graph.

• Increasing speed
• Not moving
• Decreasing speed
• Constant speed

Tags

CCSS.HSF.IF.B.4

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be 

• less than the speed it had when thrown upwards.
• more than the speed it had when thrown upwards.
• the same as the speed it had when thrown upwards.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5