Kinematics 2 - Pre-assess Version 1

A steel ball is dropped from the top of a building. How far does it drop in 3 seconds? (Use g=10 m/s²)

• 15 m

• 30 m

• 45 m

• 60 m

An object's position is described by the function x(t)=3t + 12t² +30. The object's acceleration at t = 0 is

• 0 m/s²

• 3 m/s²

• 24 m/s²

• 30 m/s²

A stone is tossed up with a velocity of v₀. Assume negligible air drag. How high can the stone rise?

• v_o² /(4g)

• v_o² /(2g)

• v_o² /g

• 2v_o²/g

A green ball is tossed up from the top of a building with a speed of v₀. A red ball is thrown downward from the same height. When they both reach the ground,

• V_G = V_R

• V_G < V_R

• V_G >V_R

• It depends on the masses.

A kangaroo jumps upward with a velocity of v_o. At the highest point, the velocity and acceleration of the kangaroo are

• 0 , g

• 0, - g

• v_o , g

• v_o , - g

• 0 , 0

The position of a particle follows the equation: x(t) = t³-12t+5

When the particle reverses position, what is the acceleration?

• 2 m/s²

• 4 m/s²

• 6 m/s²

• 10 m/s²

• 12 m/s²

The object changes direction at

• 15 minutes

• 30 minutes

• 40 minutes

• 15 and 45 minutes

From 15 to 30 minutes, the object is

• not moving

• moving forward

• moving backward

In the first 15 minutes, the object has moved

• 900 m

• 600 m

• 300 m

A bullet is fired horizontally from a gun at the top of a cliff. If a similar bullet is dropped at the same time that the first bullet leaves the muzzle, which hits the ground first?

(Neglect air drag)

• The fired bullet.

• The dropped bullet.

• Depends on the height.

• They both hit at the same time.