A cannonball fired horizontally hits the ground at the same time as one dropped from the same height. Why does this happen? Because...

• Gravity pulls on both equally hard, but at different angles

• Horizontal motion doesn’t affect how gravity pulls it down vertically

• Air resistance acts equally on both, causing them to reach the ground together

• Both objects have the same weight, so they fall at identical rates regardless of direction

A baseball player throws a ball horizontally (0°). Which statement BEST describes the ball’s motion after it is thrown? (Neglect air resistance) Its vertical speed...

• remains the same, and its horizontal speed remains the same.

• increases, and its horizontal speed increases.

• increases, and its horizontal speed remains the same.

• increases and its horizontal speed decreases

Which of the following correctly arranges the angles of projection in order of increasing maximum range attained, assuming the same initial speed for each?

I. 15 degrees                     II. 25 degrees               III. 40 degrees              IV. 60 degrees

• I-II-IV-III

• II-I-III-IV

• III-IV-II-I

• IV-III-I-II

Which of the following correctly arranges the angles of projection in order of increasing maximum height attained, assuming the same initial speed for each?

I. 25 degrees                       II. 45 degrees               III. 15 degrees              IV. 60 degrees

• I-II-IV-III

• II-I-III-IV

• III-I-II-IV

• IV-III-I-II

A basketball shot arcs and lands in the hoop. When is its vertical speed becomes zero?

• Just before it's released, because it hasn’t started moving yet

• At the moment it makes contact with the hoop or backboard

• Vertical speed is constantly changing and therefore is never truly zero

• At the top of the arc, when the ball briefly stops moving upward and starts moving downward

Refer to the illustration. What is the vertical velocity (Vy) of a projectile at the moment it is thrown horizontally?

• It increases due to gravity.

• It is equal to the final vertical velocity.

• It is equal to the final horizontal velocity.

• It is equal to the initial horizontal velocity.

A car with a mass of 1200 kg collides with a stationary car of mass 1000 kg. If the initial velocity of the moving car is 20 m/s and it comes to a stop after the collision, which of the following is the change in momentum of the car?

• 0 kg· m/s

• 2000 kg· m/s

• 24000 kg· m/s

• 40000 kg· m/s

Two cars of equal mass collide head-on. Car A was initially moving with a velocity of 10 m/s to the right, and Car B was initially moving with a velocity of 8 m/s to the left. After the collision, Car A comes to a stop. Which of the following is the velocity of Car B after the collision?

• 0 m/s

• 2 m/s, right

• 2 m/s, left

• 8 m/s, left

In a collision between two objects, which of the following conditions must be met for the collision to be considered elastic? The...

• collision occurs in a vacuum.

• momentum of the system is conserved.

• objects stick together after the collision.

• kinetic energy of the system is conserved.

During a rainy day, a delivery driver suddenly steps on the brakes. A fragile box slides forward inside the van and hits the wall. To reduce damage to packages, padded cushions are installed along the van's interior walls. Why do these padded cushions help protect the packages? They...

• increase the force applied during impact.

• reduce the time of collision, increasing the impulse.

• stop the package before it hits the wall, eliminating impulse.

• increase the time over which the impact occurs, reducing the force.