What is the si unit for force?

a kelvin
b meters
c newton
d pascal

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

What explosion in the upper solar atmosphere releases about as much energy as millions of 100-megaton hydrogen bombs exploding simultaneously?

Ineed to answer this problem but i lack in knowledge, what should i study to answer this problem? i have never used derivatives in a physics problem so i'm not sure what's happening and i can't find videos explaining.