Why does in the second law of newton says that if you have more mass u have less aceleration?

Answer 1

force = mass x accleration, or F = ma
For the same force but increased mass, the accleration has to diminish and vice versa.

Answer 2

Your serious? Think about a foot race between two people, one weighs 100 pounds the other ways 200 pounds, the lighter person could accelerate much quicker than the heavier person! Given that they had an equal ability. You cannot compare a 100 pound 3rd grader to a 200 pound college athlete!

Answer 3

because the more mass, the heavier it is so there is less speed (acceleration=distance/time)