A man on a skateboard carrying a dictionary is initially at rest. He heaves the dictionary forward with a speed of 0.97 m/s and he recoils backwards with a speed of 0.04 m/s. If the dictionary’s mass is 3.24kg what is the mass of the man?

Ithink it is letter b, i may be wrong but i think that is the answer

Ray 2 should cross through the focal point on the right side of the lens.

Hellosubatomic particles  are  particles  that are smaller than the atom. protons, neutrons, and electrons are the three mainsubatomic particles  found in an atom. protons have a positive (+)  charge. an easy way to remember this is to remember that both neutron and no  electrical charge  start with the letter "n."have a nice day