một ô tô chuyển động thẳng nhanh dần đều qua hai điểm A, B cách nhau 20m trong 2s vận tốc o tô tại B là 54km/h . tìm gia tốc và vận tốc ô tô tại A

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

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?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?