Exam 3: Linear Motion

Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?

An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s², then its speed reading would increase each second by

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

While an iron block near the Earth's surface is in free fall, it undergoes an increase in

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. How far below the level from which it was thrown is the rock 2 seconds later?

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

A pot that falls from a ledge and hits the ground 45 m below hits the ground at

An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

The two measurements necessary for calculating average speed are

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

A ball rolls along a horizontal track in a certain time. If the track has a dip in it, the time to roll the length of the track will be

An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of

A ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is

Compared with hang time on Earth, hang time on the Moon would be

A vehicle undergoes acceleration when it

The accelerations possible for a ball on an inclined plane

If an object moves with constant acceleration, its velocity must