John is traveling north at 20 meters/second and his friend betty is traveling south at 20 meters/second. if north is the positive direction, what are john and betty's speeds? a. -20 meters/second, 20 meters/second b. 20 meters/second, 20 meters/second c. -20 meters/second, -20 meters/second d. 0 meters/second, 40 meters/second

B. 20 meters/second, 20 meters/second

Explanation:

Velocity of John = 20 meters/second north = +20 meters/second

Velocity of Betty =  20 meters/second south = -20 meters/second

If north is considered as positive then south will be negative.

So, the velocity of John will be +20 meters/second and velocity of Betty will be -20 meters/second.

But, the question is about their speeds and not velocity. The signs represent the directions. Speed does not show direction.

So, speed of John and Betty is 20 meters/second.

Images produce by convex lens are dependent on the focal length of the lens as well as the distance between the object and the lens. The distance between the center of the lens and the focal point is referred to as the focal length of the lense. At the focal point, light will converge as it passes through the lens. Lenses have the ability to create numerous different image sizes and orientations. Generally, the images are based on the lens' focal length as well as where the object is location.