Projectile motion

What is the horizontal acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²

Two spheres A and B, where A has twice the mass of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m.  Sphere B leaves a shelf 1.0 m off the floor.

Which ball will be in the air for the greater amount of time?

• Ball A

• Ball B

• They will be in the air for the same amount of time.

• There is not enough information to decide.

Two spheres of equal mass, A and B, are projected off the edge of a 2.0 m high bench. Sphere A has a horizontal velocity of 5.0 m/s and sphere B has a horizontal velocity of 2.5 m/s.

Which ball will be in the air for the greater amount of time?

• Ball A

• Ball B

• They will be in the air for the same amount of time.

• There is not enough information to decide.

Sphere A is projected off the edge of a 1.0 m high bench with a horizontal velocity of 2.0 m/s.  Sphere B is dropped from the same height as Sphere A.  Both spheres have the same size and mass.

Which ball will be in the air for the greater amount of time?

• Ball A

• Ball B

• They will be in the air for the same amount of time.

• There is not enough information to decide.

The vertical component of Velocity of a projectile at its maximum height

• $u\ \cos\theta$

• $u\ \sin\ \theta$

• $zero$

• $u^2\ \sin^2\theta$

A cannonball is fired off of a cliff that is 39 meters high. The cannonball has a horizontal velocity of 65 m/s. How away from the cliff does the cannonball land?

• 182 seconds

• 182 m

• 39 m

• 9.81 m

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Two spheres of equal mass, A and B, are projected off the edge of a 2.0 m high bench. Sphere A has a horizontal velocity of 5.0 m/s and sphere B has a horizontal velocity of 2.5 m/s.

Ball A hits the floor at the spot marked X. Where will ball B hit the floor?

• between the table and X.

• at the same distance as X.

• at some point past X.

• There is not enough information to decide.

Sphere A is projected off the edge of a 1.0 m high bench with a horizontal velocity of 2.0 m/s.  Sphere B is dropped from the same height as Sphere A.  Both spheres have the same size and mass.

Which ball will have the greater vertical speed at the point of impact?

• Ball A

• Ball B

• They will have the same speed at impact.

• There is not enough information to decide.

Describe the horizontal range of projectile.

• A. It is the horizontal distance travelled by the projectile during entire motion.

• B. The parabolic path followed by a projectile in air is called its trajectory.

• C. The point from which the object is projected in air.

• D. None of the above.