A beaver runs at a speed of 2.0m/s with 45 J of kinetic energy. What is the beaver's mass?
Round answer to two significant digits.

What is the answer for this. the correct answer only

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

It is really hard for me right know