Please help ASAP I’m in a rush to get this done :(

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Which is a substance that can be separated by physical means and is not the same throughout

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?