Posted by **Jayd** on Wednesday, November 7, 2007 at 1:02pm.

A 9 kg lead brick falls from a height of 1.8 m. a) Find the momentum as it reaches the ground. b) What impulse is needed to bring the brick to rest? c) The brick falls onto a carpet 2.0 cm thick. Assuming the force stopping it is constant, find the average force the carpet exerts on the brick. d) If the brick falls onto a 5.0 cm foam rubber pad, what constant force is needed to bring it to rest?

- Physics -
**drwls**, Wednesday, November 7, 2007 at 2:54pm
a) momentum = mass * velocity

Compute the velocity from the height it falls. Look up the formula for that or use conservation of energy.

b) Impulse = momentum

c) work done compressing carpet (F*X) = initial kinetic energy

d) Same approach as (c)

I will be happy to critique your thinking

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**Anonymous**, Thursday, December 17, 2009 at 12:00am
how the f do you do this

- Physics -
**Anonymous**, Sunday, September 16, 2012 at 1:06pm
Suppose a brick has a mass of 4.50 kg. What is the brick's weight at the surface of the Earth

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