100 J of work was done to lift a 10-N rock and set it at Position A near the edge of a cliff. 1. If the 100 Joules of work lifted the rock to the top of the cliff, how much potential energy did the rock gain?

2. At point C, the rock’s potential energy will be _.

3. The rock’s kinetic energy at point A is _.

4. At point B, some of the rock’s potential energy will be changed to _ energy.

5. What is the mass of the rock?

6. What is the rock’s velocity just before it hits the ground?

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2