The force of gravity on a 2kg rock is twice as great as that on a 1kg rock. Why then doesn’t the heavier rock fall faster?

What is the measurement of how fast an object moves relative to a reference point?

To a of 4 x hz is 1. 0. mm nm nm

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?