The following are possible ways to express the quantity 0.391
(give all correct answers, i. e., b, ac, ( answer in alphabetical order! )
note: 3.45e-8 is a way you can enter the number 3.45×10-8 in most computers.

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.