A train travels 51 kilometers in 2 hours, and then 53 kilometers in 5 hours. What is its average speed?

What type of stars can collapse in a supernova explosion and become neutron stars

Explain the gradation in reactivity of halogen family

Which of the following statements about the rate of stellar evolution is true? The more massive the original star, the slower the evolution, because there is more material for thermonuclear burning.

A tennis player hits a ball with an initial speed of 23.6 m/s perfectly horizontally. The ball is 2.37 m above the ground when struck by the racquet. If the net is 12 m from the ball and the net height is 0.

Based on Newtown law does gravity increase

Charlotte, a 60.0-kg skin diver, shoots a 2.0-kg spear with a speed of 15 m/s at a fish who darts quickly away without getting hit.

All objects are attracted to each other by the force of a. weight. b. mass. c. inertia. d. gravity.

landslides and mudslides caused by lava flows are ___ deadly than the lava flow itself. a. more b. less

3. How is electric potential different than electric potential energy?

Ethan pushes a wooden box across a carpet floor then he pushes the same box across a smooth marble floor why does Ethan find it easier to push the box on the marble floor than carpet floor