An object falls freely from rest near the surface of the Earth. What is the speed of the object when it has fallen 4.9 meters from its rest position?

a) 4.9m/s

b) 96 m/s

c) 9.8 m/s

d) 24m/s

I know that it is letter "c" but I don't know why.

What is an advantage of using oil instead of wind power to generate electricity? A. Oil can be used when there is no wind. B. Oil is nonrenewable. C. Oil produces no pollution. D. Oil releases greenhouse gases when burned.

Should the shape of an object be considered a property of the material?

What accurately describes the relationship between brain damage and language impairment?

Joan is setting up an experiment in the lab to observe newton's second law of motion. she has a model car that has a mass of 45 kg, and it is accelerating at 7 m/s/s. she then increases the acceleration to 28 m/s/s.

An example of an opinion would be which of the following? bob s burgers is the best show on television. cake is appropriate for many occasions. earth is 238,900 miles from the moon. none of these

If the density of an object is 30 g/cm3 and its volume is 10 cm3, what is its mass in grams?

Explain how atoms are aligned in a magnet in terms of the North and South poles.

Which of the following has the largest gravitational potential energy A. a 10kg dog running down the street at 30mph B. a tightrope walker slowly crossing niagara falls C. a 0.02kg bullet moving down the barrel at 800mph D.

Why does the speed of an object change when a force acts on it?

What are factors that would change the position of the wave lengths measured? (There are more than one answer.) a) size of the tube b) tuning fork frequency c) distance between the tuning fork and tube d) room temperature e) area of the tube