Question #f33b1

1 Answer
Jun 10, 2017

v=40ms

Explanation:

Since the body is falling under the influence of gravity (free fall), we can use the following equation to find the velocity at which the body will hit the ground

aaaaaaaaaaaaaaaaaaav=2hg

Where
h = height at which the body falls with respect to some level (m)
g = gravitational acceleration constant(9.8ms2)

aaa

Plugin and solve (ignored units)

  • v=2hgv=2×80×9.8

  • v=40ms

rounded to 1 significant figure, the number given in the problem.