Explanation:
Newton's second law states that force is equal to the change in momentum per unit of time.
Mathematically;
Force = mass x acceleration
From the second law, we find that for higher acceleration, mass must be minimal.
Mass is inversely proportional to acceleration;
So;
A mountain packer that packs too much gear will have a high mass and this will reduce his acceleration.
The lighter he packs, the lower his mass and the more his acceleration would be.