What is the frequency of radiation whose wavelength is 0.86 nm,?

Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

Will you chech and finish these for me, because i am stumped with them.

What is the momentum of a 2 kg object moving at 15 meters per second