# AP Physics B : Understanding Vector and Scalar Quantities

## Example Questions

### Example Question #1 : Understanding Vector And Scalar Quantities

A ball is thrown at a velocity of  at an angle of  from the horizontal. What are the ball's horizontal and vertical velocities?

There is not enough information to solve this problem

Explanation:

The velocity of  can be broken into horizontal and vertical components by using trigonometry. Think of the figure below, where x and y velocity components of the total velocity are shown.

Use the total velocity, the x-component, and the y-component to form a right triangle below.

Treating  as the hypotenuse, x-component as the leg adjacent, and y-component as the leg opposite, you can conclude that the velocities are related through trigonometric identities.

Plugging in the given values, we can solve for the x and y velocity components.

### Example Question #110 : Fundamentals Of Force And Newton's Laws

Which answer choice below includes only scalar quantities?

Acceleration, energy, displacement

Distance, speed, time

Force, time, velocity

Velocity, displacement, force

Displacement, time, acceleration