John is conducting an experiment that involves melting ice cubes. Which of the following is most important for John to collect reliable data? A. The outcome needs to be controlled.

B. An unbiased observer must witness the experiment.

C. Technology needs to be used to determine the results.

D. Only one variable should be tested during the experiment.

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Choose each of the settings that follow and list them below do it ill mark brainliest first object= position= speed= acceleration= second object= position= speed= acceleration=

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.