It takes acheetah just 3 s to reach its top speed of 30 m/s. what is its acceleration?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.