If the force acting on an object is doubled, and its mass remains constant, what happens to its acceleration?
Correct: C
According to Newton's Second Law, F = ma, or a = F/m. If the force (F) is doubled to 2F, and the mass (m) remains constant, the new acceleration a' = (2F)/m = 2(F/m) = 2a. Thus, the acceleration is doubled.