A 25-tons freight car ran into another freight car of the same mass. The first moves at 2.7m/s and the second moved towards the first at the speed 0.5 m/s. If the cars were coupled. together after the collision, what was their final speed?

Herbivores, carnivores, and omnivores are all types a. decomposers b. producers c. consumers d. biomes

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Determine the maximum r-value of the polar equation r =3+3 cos 0