The speed of a wave is 65 m/sec. if the wavelength of the wave is 0.8 meters, what is the frequency of the wave

Ineed with a, b, c, d, and e on the long answer

Describe the interaction that occurs between two objects with the same electrical charge.

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here