A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes an 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
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A $2 \mathrm{~kg}$ block slides on a horizontal floor with a speed of $4 \mathrm{~ms}^{-1}$. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is $15 \mathrm{~N}$ and spring constant is $10000 \mathrm{~ms}^{-1}$. The spring compresses by (a) $8.5 \mathrm{~cm}$ (b) $5.5 \mathrm{~cm}$ (c) $2.5 \mathrm{~cm}$ (d) $11.0 \mathrm{~cm}$
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Round 2
A $2 \mathrm{~kg}$ block slides on a horizontal floor with a speed of $4 \mathrm{~m} / \mathrm{s}$. It strikes an uncompressed spring, and compresses it till the block is motionless. The kinetic friction force is $15 \mathrm{~N}$ and spring constant is $10,000 \mathrm{~N} / \mathrm{m}$. The spring compresses by $[\mathbf{2 0 0 7}]$ (A) $8.5 \mathrm{~cm}$ (B) $5.5 \mathrm{~cm}$ (C) $2.5 \mathrm{~cm}$ (D) $11.0 \mathrm{~cm}$
A 2.50 -kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0300 $\mathrm{m}$ . The spring has force constant 840 $\mathrm{N} / \mathrm{m}$ . The coefficient of kinetic friction between the floor and the block is $\mu_{\mathrm{k}}=0.40 .$ The block and spring are released from rest and the block slides along the floor. What is the speed of the block when it has moved a distance of 0.0200 $\mathrm{m}$ from its initial position? (At this point the spring is com- pressed 0.0100 $\mathrm{m.}$ .
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