A wave with a frequency of 5Hz travels a distance of 40mm in 2 seconds. What is the speed of the wave​

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost