What is the frequency of a wave that has a wave speed of 80 m/s and a wavelength of 0.20 m?

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

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

In a good thermo flask the main cause of heat loss is