A child runs at 2.6 m/s , jumps on her sled and slides down a snow-covered hill with an acceleration of 3.0 m/s2 . How fast is she going at the bottom of the hill if it takes 4.5 seconds to get there?

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.