A coin is dropped from the top of the Tower of Pisa, 53 m above the ground. Suppose instead the coin was tossed in the air with an initial velocity of 4.5 m/s [up]. What is the coin’s velocity right before it hits the ground?

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?