Johannes Kepler mathematically determined the motion of planets in our solar system. He stated those results in his laws of planetary motion. According to
these laws, how do planets move in the solar system?

A- Elliptical orbits around the sun

B- Circular orbits around earth

C- circular orbits around the sun

D- Elliptical orbits around the Earth

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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)

Acar travels 40m in 8 seconds find the car speed