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Questions  

A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes a uncompressed spring, and compresses it till the block is motionless. The kinetic
friction force is 15 N and spring constant is 10,000 N/m. The spring compresses by

a
11.0 cm
b
8.5 cm
c
5.5 cm
d
2.5 cm

detailed solution

Correct option is C

Here, we have12mv2=Fx+12kx2 or 12(2)(4)2=15x+12(10000)x2 or 5000x2+15x−16=0 ohring it, we get X=5⋅5cm

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