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MCQMediumJEE Main 2025 · 3 April, Shift 2Kinetic Energy & Work-Energy Theorem

Physics Question from JEE Main 2025 · 3 April, Shift 2

A block of mass 1 kg1 \, \text{kg}, moving along xx with speed vi=10 m/sv_i = 10 \, \text{m/s} enters a rough region ranging from x=0.1 mx = 0.1 \, \text{m} to x=1.9 mx = 1.9 \, \text{m}. The retarding force acting on the block in this range is Fr=−kxF_r = -kx N, with k=10 N/mk = 10 \, \text{N/m}. Then the final speed of the block as it crosses this rough region is

  • A

    10 m/s10 \, \text{m/s}

  • B

    4 m/s4 \, \text{m/s}

  • C

    6 m/s6 \, \text{m/s}

  • D

    8 m/s8 \, \text{m/s}

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