A ball with mass of 45 grams is bounced off the ground and travels 35.4 meters in 3.68 seconds. What is the kinetic energy as it bounced off the ground? O 9400 J
O 9.40 J
O 94.0 J
O 940 J

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?