Why does a heavy toy car go faster than a lighter toy car and get acorss a jump?

Why does a heavy toy car go faster than a lighter toy car and get acorss a jump?
A heavier toy car is better to go down a ramp and make a jump better than a light car because the heavier the toy car is, the faster gravity will force it to roll down the ramp, and with all its speed, be able to make the jump. Of course, you wouldn't want to make the toy car so heavy so that it barely or doesn't move at all. Just like drops of water when it's raining outside and a few drops hit your window. The heavier drops drip off faster than the smaller ones, and that goes the same with cars, too.