A) what distance must the bricklayer compress the spring initially? B) What is t

Question

A) what distance must the bricklayer compress the spring initially?

B) What is the work done by gravity? by the spring on the brick?

A bricklayer builds a device for shooting bricks up to the top of the wall where he is working. He places a brick on a vertical compressed spring with force constant m above its initial position on the compressed spring. A) what distance must the bricklayer compress the spring initially? B) What is the work done by gravity? by the spring on the brick? kg and is to reach a maximum height of3.6 N/m and negligible mass. When the spring is released, the brick is propelled upward. If the brick has mass 1.80 k = 450

Explanation / Answer

a) conservation of energy

1/2 kx^2 = m g h

0.5*450*x^2 = 1.8*9.81*3.6

x=0.53 m

b) W gravity = -m g h = -1.8*9.81*3.6=-63.6 J

W spring = 1/2 k x^2 = 63.6 J

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