Edward Alexander Bouchet was the first African American to earn a doctoral degree in the United States. He earned his Ph.D from Yale and was only the sixth person of any race to earn his doctoral degree in physics from an American university. One of the foundational equations that physicists like Bouchet must learn relates the energy of motion, E , mass, m , and momentum, p . The equation states that the energy of an object is equal to the square of its momentum divided by twice its mass. Solve the equation for momentum, p . E = p 2 2 m = 2 2 option 1 of 4 p = ± √ E 2 m = ± 2 p = ± √ E 2 m = ± 2 option 1 of 4 option 2 of 4 p = ± √ 2 m E = ± 2 p = ± √ 2 m E = ± 2 option 2 of 4 option 3 of 4 p = ± √ E ⋅ 2 m = ± ⋅ 2 p = ± √ E ⋅ 2 m = ± ⋅ 2 option 3 of 4 option 4 of 4 p = ± √ E ⋅ 2 m