Question

Question #f33b1

Answer 1

`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.