If your smart in science please help me, thank u

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

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?