URGENT A force of 35 N is used to stretch a spring 15 cm beyond its normal length. What is the
increase in the spring's energy?

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Could someone me find the answer to this problem.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?