Robert Hooke used a microscope to observe tiny spaces in dead cork bark.
What did his observations lead to the discovery of?
A. Bacterial cells
B. Plant cells
C. Cell division
D. Cell organelles

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy