A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ m to stop under full braking.

Although the United States has less than 5% of the world's population, it accounts for approximately ______________ of the world's annual consumption of fossil fuels.

A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m. Neglecting friction, what is the speed of the object when it is moved 2.5 m?

A 0.10-kg ball is dropped from a height of 10 m and rebounds to a height of 8.0 m.
a. Is energy conserved in the ball?
b. If not, how much energy was lost, and what happened to it?

The bob of a simple pendulum is 0.50 m above the floor at its lowest position. Calculate the maximum speed of the bob when it is held at a maximum height of 2.5 m and released.

A student with a 5.0-kg book bag on her way to class climbs two flights of stairs (a 10-m vertical distance) in 15 s. At what rate did the student do work in carrying the book bag up the stairs?

A 5.00-kg object is lifted from the floor to a shelf. The object's new gravitational potential energy relative to the floor is 102 J. What is the height of the shelf?

Work in the amount of 280 J is done in lifting an object a distance of 4.0 m in a time of 7.0 s.
a. How much force did it take to lift the object?
b. What was the power input?

Car B is traveling twice as fast as car A, but car A has twice the mass of car B. Which car has the greater kinetic energy and by what factor is it greater?