# physics

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calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.

• physics -

If it is sliding to a stop along a horizontal surface, the initial kinetic energy equals the work done against friction. I will assume the weight is in Newtons

(M/2)Vi^2 = Ff*S

M = (19600 N)/g = 2000 kg

Ff = friction force = 1000*900/100
= 9000 N

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