01 Table 1 gives some descriptions of position and
motion. Tick to show which of them describe
vector quantities
[2 marks]

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

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?

Why does gravity have a lesser than grater effect on higher altitudes?