# A .6 kg brick is dropped from a height of 8 m. It hits the ground and comes to rest. What is the magnitude of the impulse exerted by the ground on the brick?

Jun 9, 2018

$\text{7.5 kg m/s}$

#### Explanation:

Velocity when it hits the ground is

"v" = sqrt("2gH")

$\textcolor{w h i t e}{\text{v") = sqrt(2 × "9.8 m/s"^2 × "8 m}}$

color(white)("v") = 12.5\ "m/s"

Magnitude of Impulse exrted by ground on brick is

$\text{I = |m(v – u)} |$

color(white)("I") = |0.6\ "kg" × "(0 m/s – 12.5 m/s)"|

color(white)("I") = 7.5\ "kg m/s"