2D Motion

A volleyball player spikes the ball and hits the 0.5 kg ball with a force of 420 newtons. The player feels the impact of the ball on her hand and arm. How much force does the ball exert on her hand to give the player this sensation?

• 210 N

• 420 N

• 500 N

• 240 N

Compared to the range of a bullet shot horizontally just above horizontal ground, a bullet shot from the same position at an angle of 20 degrees with the same initial velocity as the first bullet, would travel a horizontal distance that is ―

• not as far

• the same

• farther

• shorter

Baseball A is thrown horizontally off of a cliff with a velocity of 30 m/s. The baseball lands 80 m from the base of the cliff.

A second ball (Baseball B) is dropped from the same height from which Baseball A was thrown.

If both baseballs are released simultaneously, which one will strike the ground first?

• A

• B

• Depends on the height of the cliff

• Same time

A cannon is fired horizontally at 243 m/s off of a 62 meter tall, shear vertical cliff. How far in meters from the base of the cliff will the cannon ball impact the ground? Ignore any effects of air resistance. Round to the nearest whole number.

y = (1/2)at²

v = d_x/t

• 647 m

• 864 m

• 464 m

• 865 m

What is the magnitude of the vertical acceleration of a rock once it is thrown from a cliff?

• 0 m/s2

• 3 m/s2

• 20 m/s2

• 9.8 m/s2

At the top of a projectile's path above Earth, the acceleration of an object —

• is zero

• goes from positive to negative

• goes from negative to positive

• stays the same

A 2.0 kg ball is moving in a 1.0 m horizontal circle every 3.4 s. The rock experiences —

• no net force

• a centripetal acceleration

• only acceleration of gravity

• motion due to its inertia

A student throws a baseball upwards at an angle of 60 degrees to the horizontal. The initial horizontal and vertical components are 12.5 m/s and 21.7 m/s, respectively.

The student can maximize the horizontal displacement of the baseball by---

• increasing the angle

• decreasing the angle to 45 degrees

• decreasing the angle to 30 degrees

• angle has no effect

A basketball was thrown with an initial velocity of 24 m/s at an angle above the horizontal. It remained in the air for 2 s. Which of the following quantities was constant while the basketball was in the air?

• acceleration

• displacement

• position

• velocity

A gun is fired horizontally at 243 m/s off of a 62 meter tall, shear vertical cliff. How many seconds will have elapsed before the bullet strikes the ground? Round to the nearest tenths place. y = (1/2)at²

• 3.6 s

• 3.62 s

• 5.4 s

• 2.32 s