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January 26, 2015

January 26, 2015

Posted by **Anne** on Saturday, December 6, 2008 at 8:45pm.

What i did was F = umg = 2.73 = ma. so a = 2.45.

then i used Vf^2 = Vo^2 + 2a(deltaX) so Vo = 6.8.

then M1V1 = (M1+M2)(V1)'

But my V1 is 507 m/s while the answer is 515 m/s.

Where did i go wrong?

- PHysics -
**bobpursley**, Saturday, December 6, 2008 at 9:04pmm1v1=(m1+m2)v

but 1/2 (m1+m2)v^2=u(m1+m2)gd

v=sqrt2ugd

v1=(m1+m2)sqrt2ugd /m1

= (1.115)/.015 sqrt(2*.25*9.8*95)

I dont get either of those answers.

Your Vo is wrongly computed.

vo=sqrt(2ad)=sqrt(2*2.45*95)=21.6m/s

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