In order to get a 15kg object moving to the west, a force of just more than 25 N must be exerted. Once it is moving, however, a force of only 20 N accelerates the object at 0.1 m/s2 to the west. What if the force that static friction can exert on the object? What is the force of kinetic friction?

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?