Acar at a stoplight has a velocity of 0 km/hr. three seconds after the light turns green, the car has a velocity of 30 km/hr. what is the acceleration of the car?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

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

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.