A car was at a 30km marker and began to drive. The car passed a 90km marker and the time had changed 30 minutes. What was the average speed of the car? Show your work.

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

Order the sequence of ideas that lead to marie curies discovery of radioactive elements number the events in chronological order starting with the oldest

J. j. thomson’s experiment disproved the theory that an atom