He watches jack throwing a ball toward home at 15 m/s while jack is also running in from the outfield at 5 m/s. what is the velocity of the ball from bill's and jack's perspectives?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)

Frequency of electromagnetic waves that a radio station is assigned is called