Posted by **archi** on Thursday, October 6, 2011 at 8:55pm.

A moving 2.20kg block collides with a horizontal spring whose spring constant is 419 N/m. The block compresses the spring a maximum distance of 9.00cm from its rest postion. The coefficient of kinetic friction between the block and the horizontal surface is 0.140.

a) What is the work done by the spring in bringing the block to rest?

b) How much mechanical energy is being dissipated by the force of friction while the block is being brought to rest by the spring?

c) What is the speed of the block when it hits the spring

- physics please help!! -
**bobpursley**, Thursday, October 6, 2011 at 9:12pm
a. 1/2 k x^2 is the work done by the spring.

b. workfriction= mu*mg*x

c. 1/2 mv^2= a)+ b) solve for v

- physics please help!! -
**archi**, Thursday, October 6, 2011 at 9:39pm
what is x?

- physics please help!! -
**bobpursley**, Thursday, October 6, 2011 at 9:40pm
x is the displacement of the block when compressed.

- physics please help!! -
**archi**, Thursday, October 6, 2011 at 9:50pm
so, in this case its 9cm?

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