In an attempt to save time. A fosses a paintbrush up to B. Icom the ground. The paintbrush has an upward initial velocity of 11 m/s. Unfortunately, B is unable to catch and the paintbrush falls back to the
ground
How much time does it take for the paint brush to reach its maximum height?

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?