The picture represents the process that produces most of the energy used by living organisms on Earth.
Which process is represented in the picture?
A)The magnetic attraction between two hydrogen nuclei.
B)The fusion of hydrogen nuclei to produce a helium nucleus in the core of
the Sun.
C)The fission of hydrogen nuclei to produce a helium nucleus in the core of
the Sun.
D) The chemical reaction between hydrogen nuclei to produce a helium
nucleus in Earth's atmosphere.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.