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?

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Answer 1 · 2018-06-09T14:04:52

#"7.5 kg m/s"#

Velocity when it hits the ground is

#"v" = sqrt("2gH")#

#color(white)("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

#"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"#