Sorry by mistake btw what is a prism

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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?

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero