According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, this can be expressed as:
F = m * a
Where F represents the net force, m represents the mass, and a represents the acceleration.
If we keep the initial velocity constant and double the mass of an object, the acceleration will decrease. This can be understood by rearranging the equation for Newton's second law:
a = F / m
When the mass (m) is doubled while the net force (F) remains the same, the denominator in the equation increases, resulting in a smaller value for acceleration (a). Therefore, doubling the mass while keeping the initial velocity constant will cause a decrease in acceleration.