how can we calculate acceleration in motion which is not uniform or uniformly accelerated please help tell me another formula to calculate acceleration

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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?

Which is an example of an exothermic process?