Projectile Motion

A horizontally-launched projectile arcs out and hits the ground below. The vertical displacement and the horizontal displacement are measured. What is the best equation to use to find the time the projectile was in the air?

• $\overrightarrow{d}_x=\overrightarrow{v}_x\cdot t$

• $\overrightarrow{d}_y=+\frac{1}{2}\cdot g\cdot t^2+\overrightarrow{v}_{yi}\cdot t$

• $\overrightarrow{v}_{yf}=\overrightarrow{v}_{yi}+g\cdot t$

• $t=\sqrt{\frac{2\cdot\overrightarrow{d}_y}{g}}$

In the diagram, which letter represents the vertical displacement  $\overrightarrow{d}_y$  ?

• A

• B

• C

• D

In the diagram, which letter represents the horizontal displacement $\overrightarrow{d}_x$ ?

• A

• B

• C

• D

A ball rolls off a table top and strikes the floor as shown. Given the measurements made, the time the projectile spent in the air is ---.

• 17 s

• 0.34 s

• 0.58 s

• 0.49 s

Tags

NGSS.HS-PS2-1

A ball rolls off a table and strikes the floor, as shown. If the time the ball spent in the air was 0.58 s, how fast did the ball leave the table?

• 3.6 m/s

• 1.2 m/s

• 2.9 m/s

• 0.99 m/s

Tags

NGSS.HS-PS2-1

A skateboarder rolls off a bridge into the river as shown. If the skateboarder was originally moving at 7.0 m/s, how much time did the skateboarder spend in the air?

• 1.3 s

• 0.79 s

• 38.5 s

• 0.70 s

• Not enough information given.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A skateboarder rolls off a bridge into the river as shown. If the skateboarder spent 0.79 s in the air, how far above the river is the edge of the bridge?

• 5.5 m

• 0.70 m

• 1.3 m

• 3.1 m

• Not enough information given.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

In the picture, cannonball A was launched at 10 m/s at 60°, and B was launched at 18 m/s at 25°. The cannonball that hit the ground first was

• A, because it had less total velocity.

• B, because it had more total velocity.

• A, because it had less initial vertical velocity.

• B, because it had less initial vertical velocity.

A projectile is launched with a horizontal velocity of 20 m/s and an initial vertical velocity of 20 m/s. Which graph correctly shows the vertical velocity of the projectile over time?

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Tags

NGSS.HS-PS2-1

A projectile is launched with a horizontal velocity of 20 m/s and an initial vertical velocity of 20 m/s. Which graph correctly shows the horizontal velocity of the projectile over time?

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