Unit 3 Kinematics Test B Projectiles

How do you choose the correct kinematic equation?

• Always go with lil pup cause it's the littlest and easiest

• Ask the sorting hat

• Google

• Choose equation that has only 1 of your unknown variables

A projectile is launched with an initial velocity of 10 m/s at an angle of 40 degrees above the horizontal. What is its initial y-velocity? (Round to two decimal places, include units)

A projectile is launched with an initial velocity of 12 m/s at an angle of 60 degrees above the horizontal.

How far away does it land? (Range)

(Hint: resolve your vector into its components, find the time in the air, then find the range).

Round your answer to two decimals, and include units!

A boat needs to travel 100 m East to cross a river. The boat moves at 6 m/s due East, and the river flows at 1.5 m/s due South. How far downstream does the boat end up? [To the nearest meter] [Hint: find the time first!]

A cannon is fired horizontally from a 5.0 m tall tower. How much time will it take until the projectile hits the ground?

• 0.5 s

• 1.0 s

• 2.0 s

• 5.0 s

What is the best angle to launch a projectile to reach maximum range?

• 10^o

• 30^o

• 45^o

• 60^o

A box is dropped from an airplane. Neglecting air resistance, where will the box be in relation to the plane when the box hits the ground?

• directly under the plane because it has the same Vx as the plane.

• behind the plane because the box will drop straight down

• in front of the plane because the plane will throw it forward

• there is not enough information to tell

A cannonball is launched horizontally at 50 m/s from an 80 m tall cliff. How far will it go (horizontally) before hitting the ground?

• 100 m

• 200 m

• 400 m

• 800 m

What is the horizontal acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²

You launch three identical parabolic projectiles from the same cannon. The launch angle for all three projectiles was 30^∘. The initial launch velocities were different.

Projectile #1 was launched at 30 m/s

Projectile #2 was launched at 20 m/s.

Projectile #3 was launched at 10 m/s.

Which projectile had the longest time of flight?

• Projectile #1

• Projectile #2

• Projectile #3

• All had equal times of flight.