A block of mass 2.62 kg is kept at rest as it compresses a horizontal massless spring(k = 141 N=m) by 15.3 cm. As the block is released, it travels 0.627 m on a rough hori-
zontal surface before stopping.
The acceleration of gravity is 9.8 m/s2 :Calculate the coe±cient of kinetic friction between surface and block.

Use the stored spring potneital energy to dtermine the kinetic energy at release. The kinetic energy KE is converted to work done against friction.
KE = Ffriction * X = M*g*(mu,k)*X
Solve for "mu,k", which is the kinetic friction coefficient

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1. a mass of 10kg moves with a velocity of 4ms-2 find it kinetic energy

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