A 6.0 x 105 kg space probe is traveling at speed vo through deep space. Retrorockets are fired to slow down the probe and they generate a force of - 1.125 x 106 N over a distance of 3000 km. The final speed of the probe is found to be 3.0 x 103 m/s. Calculate the (initial) speed vo .

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?