If the height of the building is 20.3 m, what must the initial speed be of the first ball if both are to hit the ground at the same time?

Explain why the inevitable conversion of energy to less useful forms should guide us to conserve energy resources and develop more renewable energy sources.

In Hooke's law, what does k represent? Select one of the options below as your answer: A. mass of the spring B. length of the spring C. force of the spring D. stiffness of the spring E. width of the spring

List four landforms created by wave erosion?

What is transferred to an object when work is done

Which of these factors make hudrogen fuel cells a better option than burning fossil fuels

Which of these is a mixture? calcium carbon dioxide salt water potassium

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?

1) Which is a characteristic of a metal? A) It looks dull. B) It feels brittle. C) It is a good insulator. D) It is a good conductor of electricity. 2)

1:a boy 2 a girl pulling a heavy crate at the same time w/10 unite of force each. What is the net force acting on the object