What did benjamin thompson contribute to science? a. p(↓1)v(↓1)=p(↓2)v(↓2) b. v(↓1)/t(↓1)=v(↓2)/t(↓2) c. the idea of heat energy d. the kinetic theory of matter?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?