In a fusion reaction, the nuclei of two atoms join to form a single atom of a different element. in such a reaction, a fraction of the rest energy of the original atoms is converted to kinetic energy of the reaction products. a fusion reaction that occurs in the sun converts hydrogen to helium. since electrons are not involved in the reaction, we focus on the nuclei. hydrogen and deuterium (heavy hydrogen) can react to form helium plus a high-energy photon called a gamma ray:

real, smaller and upside-down.   so the answer should be b.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

the answer to this is proletariats.

hope this : )