In object is shot up and then return to the ground. What is its acceleration rate the entire time? • 0m/s2
• 10m/s2
• 9.8m/s2
• -9.8m/s2
• -10m/s2

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?