A) A 10604-kg railroad car, A, traveling at a speed 30.9-m/s of strikes a 9924-kg car, B, going 13.3-m/s in the same direction. If the cars lock together as a result of the collision, what is their common speed just afterward? See Fig. 7–5. B) A 11076-kg railroad car, A, traveling at a speed 29.0-m/s of strikes a 11700-kg car, B, going 32.2-m/s in the opposite direction. If the cars lock together as a result of the collision, what is their common speed just afterward? See Fig. 7–5.

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? a.)mendel’s genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendel’s theory of genetics.c.)mendel’s genetics replaced darwin’s entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.