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# M5 help Watch

1. A particle, of mass 9 kg, is attached to two identical springs. The other ends of thesprings are attached to fixed points, A and B, which are 1.2 metres apart on a smoothhorizontal surface. The springs have modulus of elasticity 45 N and natural length0.4 m.
The particle is released from rest at a distance of 0.5 metres from B and moves onthe line AB. The midpoint of AB is C. At time t seconds after release, thedisplacement of the particle from C is x metres, where the direction from A to B istaken to be positivw.

Show that the resultant force on the particle, at time t, is -225newtons.

2. (Original post by Mr M)
x
Is this out of your teaching league Mr M ?
3. (Original post by schindlers list)
Is this out of your teaching league Mr M ?
Cheeky!

What have you tried? I don't teach simple harmonic motion but I can just about remember it.

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Updated: January 12, 2015
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