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Laws of Motion question

2025 · 3 Apr · Shift 2 · Q61

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JEE Main
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Laws of Motion
2025 · 3 Apr · Shift 2 · Q61

Laws of Motion question

2025 · 3 Apr · Shift 2 · Q61

JEE MainPhysicsLaws of MotionMCQ+4 / −1

A block of mass 1 kg , moving along

x

with speed

v_i=10 \mathrm{~m} / \mathrm{s}

enters a rough region ranging from

x=0.1 \mathrm{~m}

to

x=1.9 \mathrm{~m}

. The retarding force acting on the block in this range is

\mathrm{F}_{\mathrm{r}}=-\mathrm{kr} \mathrm{N}

, with k

=10 \mathrm{~N} / \mathrm{m}

. Then the final speed of the block as it crosses rough region is.

A
$4 \mathrm{~m} / \mathrm{s}$
B
$10 \mathrm{~m} / \mathrm{s}$
C
$8 \mathrm{~m} / \mathrm{s}$
D
$6 \mathrm{~m} / \mathrm{s}$

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