Which does not represent a change in velocity? Group of answer choices

A person is riding a bicycle at 4 m/s west and decreases her speed to 3 m/s.

A plane is flying south at 600 km/h and then flies directly upwards before returning to the airport.

A balloon is floating up into the air at 1 m/s.

A bus is traveling west at 2 m/s and then turns a corner.

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?