a block with a mass of 3.8 kilograms slides with a velocity of 6 m/s on a frictionless surface. it hits a horizontal spring with a spring constant of 200 n/m. how much work does the block do on the spring?

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest