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

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.HS-PS2-1

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.HS-PS2-1

NGSS.HS-PS2-4