Question

The acceleration due to gravity on planet X is
one fifth that on the surface of the earth.
If it takes 4.2 s for an object to fall a certain
distance from rest on earth, how long would
it take to fall the same distance on planet X?

Answer 1

9.4 sec

Answer 2

how??

Answer 3

g = 10 m/s^2 on Earth

g' = 10/5 = 2 m/s^2 on planet X

t = 4.2 sec

h = 1/2gt^2 = (0.5)(10)(4.2)^2 = 88.2 m is the height which the object fell from

So now we calculate t' on planet X

h = 1/2g't'^2

t' = sqrt(2h/g') = 9.4 sec

Answer 4

sweet thanks!!

Answer 5

Your Welcome