AP Physics Kinematics

A body moving in the positive x direction passes the origin at time t=0. Between t=0 an d t=1 second, the body has a constant speed of 24 m/s. At t=1 second, the body is given a constant acceleration of 6 m/s2 in the negative x direction. The position x of the body at t=11 seconds is

-36 m

A rocket near the surface of the earth is accelerating vertically upward at 10m/s2. The rocket releases an instrument package. Immediately after releasing the acceleration of the instrument package is:

10 m/s2 down

A car starts from rest and uniformly accelerates to a final speed of 20.0 m/s in a time of 15.0 s. How far does the car travel during this time?

150 m

A diver initially moving with speed v dives off the edge of a vertical cliff and lands in the water a distance d from the base of huge cliff. How far from the base of the cliff would the diver have landed if the diver initially had been moving horizontally with speed 2v?

2d

A ball which is dropped from the top of a building strikes the ground with a speed of 30 m/s. The height of the building is approximately:

45 m

An object is thrown with velocity v from an edge of a cliff above ground level. In order for the object to travel a maximum horizontal distance from the cliff before hitting the ground, the throw should be at an angle with respect to the horizontal of

Greater than zero but less than 45° above the horizontal

In the absence of air resistance, if an object were to fall freely near the surface of the moon,

The acceleration is constant

Starting from rest, object one falls freely for 4.0 seconds, and object two falls freely for 8.0 seconds. Compared to object 1, object 2 falls:

Twice as far

A whiffle ball is tossed straight up, reaches a highest point, and falls back down. Air resistance is not negligible. Which of the following statements are true? I. The balls speed is zero at the highest point II. The balls acceleration is zero at the highest point. III. The balls take a longer time to travel up to the highest point than to fall back down.

I only

A student is testing the kinematic equations for uniformly accelerated motion by measuring the time it takes for light weight plastic balls to fall to the floor from a height of 3 m in the lab. The student predicts the time to fall using g as 9.80 m/s2 but finds the measured time to be 35% greater. What is the most likely cause of the large percent error?

The acceleration of the plastic balls is not uniform.

The velocity of a projectile at launch has a horizontal component Vv. Air resistance is negligible. When the projectile is at the highest point of its trajectory, which of the following shows the vertical and horizontal component of its velocity and the vertical component of its acceleration?

Vertical velocity=0. Horizontal velocity= Vh. Vertical acceleration=g

An object is thrown with a fixed initial speed Vo at various angles relative to the horizon. At some constant height h above the launch point the speed v of the object is measured as a function of the initial angle. Which of the following best describe the dependence of v on the angle?

v will remain constant, independent of the angle