Question

If two ball which mass is 20 kg and 2 kg dropped in vaccum which ball fell down to ground first?

Answer 1

Both ball fall with same speed and reach the ground at same time in vaccum.

Answer 2

if you drop these 2 balls in vaccum then both of the balls will reach the ground at the same time because , in vaccum there is no air therefore no air resistance  (friction applied on a body by air)  . Both of the balls were at rest before the were dropped(initial velocity =0m/sec)  .Since the value of acceleration due to gravity(g) is fixed(9.8m/sec^2), they will accelerate uniformly and attain a uniform velocity  and reach the ground at the same time.

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