At what speed does a 1600 kg compact car have the same kinetic energy as a 20000 kg truck going 23 km/h

The midpoints? a, b, and c are marked on the histogram. match them to the indicated scores. which? scores, if? any, would be considered? unusual?

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

Atomic nuclei of almost all elements consist of