Exam 2: One-Dimensional Kinematics

To determine the height of a flagpole,Abby throws a ball straight up and times it.She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s.How high is the pole above the point where the ball was launched? Neglect air resistance.

A polar bear starts at the North Pole.It travels 1.0 km south,then 1.0 km east,and then 1.0 km north to return to its starting point.This trip takes 45 min.What was the bear's average velocity?

Which of the following quantities has units of a velocity? (There could be more than one correct choice. )

The motion of a particle is described in the velocity vs.time graph shown in the figure. Over the nine-second interval shown,we can say that the speed of the particle

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s² and there is no atmosphere.How long does it take for the instrument to return to where it was thrown?

You are driving home on a weekend from school at 55 mi/h for 110 miles.It then starts to snow and you slow to 35 mi/h.You arrive home after driving 4 hours and 15 minutes.How far is your hometown from school?

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?

If the velocity versus time graph of an object is a horizontal line,the object is

A cart starts from rest and accelerates uniformly at 4.0 m/s² for 5.0 s.It next maintains the velocity it has reached for 10 s.Then it slows down at a steady rate of 2.0 m/s² for 4.0 s.What is the final speed of the car?

Consider a deer that runs from point A to point B.The distance the deer runs can be greater than the magnitude of its displacement,but the magnitude of the displacement can never be greater than the distance it runs.

A certain test car can go from rest to 32.0 m/s in 3.88 s.The same car can come to a full stop from that speed in 4.14 s.What is the ratio of the magnitude of the starting acceleration to the stopping acceleration?

What must be your average speed in order to travel 350 km in 5.15 h?

The slope of a position versus time graph gives

Under what condition is average velocity equal to the average of the object's initial and final velocity?

You leave on a 549-mi Trip in order to attend a meeting that will start 10.8 hr. After you begin your trip.Along the way you plan to stop for dinner.If the fastest you can safely drive is 65 mi/h,what is the longest time you can spend over dinner and still arrive just in time for the meeting?

Ball A is dropped from the top of a building.One second later,ball B is dropped from the same building.Neglect air resistance.As time progresses,the difference in their speeds

An object is dropped from a bridge.A second object is thrown downwards 1.0 s later.They both reach the water 20 m below at the same instant.What was the initial speed of the second object? Neglect air resistance.

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building,and neither one experiences appreciable air resistance.Which statement about their accelerations is correct?

A motorist travels 160 km at 80 km/h and 160 km at 100 km/h.What is the average speed of the motorist for this trip?

You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h.Your average speed over the 12 km drive will be