Aperson takes a trip, driving with a constant speed of 89.5 km/h, except for a 22.0-min rest stop. if the person’s average speed is 77.8 km/h, (a) how much time is spent on the trip and (b) how far does the person travel?

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?