Question #f33b1

1 Answer
Jun 10, 2017

color(blue)[v = 40 "m"/"s"

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

color(white)(aaaaaaaaaaaaaaaaaaa)color(orange)[v = sqrt(2hg)}

Where
"h = height at which the body falls with respect to some level (m)"
"g = gravitational acceleration constant" (9.8 m/s^2)

color(white)(aaa)

Plugin and solve (ignored units)

  • v = sqrt(2hg)->v = sqrt(2xx80xx9.8)

  • color(blue)[v = 40 "m"/"s"

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