Question #f33b1

1 Answer
Maxwell · Nathan L.
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.

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