Calculate the ke of a 3.1 kg toy cart that moves at 4.8 m/s. calculate the ke of the same cart at twice the speed.

Which statements best describe the work of marie and pierre curie? check all that apply. they discovered radioactivity. they came up with the term “radioactivity.” they conducted experiments with uranium-containing minerals and pure uranium. they conducted experiments with uranium-containing minerals and photographic plates. they discovered two new radioactive elements.