Physics

Problem

A block of mass 2 kg moving on a horizontal surface with speed of

4 \text{ ms}^{-1}

enters a rough surface ranging from

x = 0.5 \text{ m}

x = 1.5 \text{ m}

. The retarding force in this range of rough surface is related to distance by

F = -kx

where

k = 12 \text{ Nm}^{-1}

. The speed of the block as it just crosses the rough surface will be: (a) Zero (b)

1.5 \text{ ms}^{-1}

(c)

2.0 \text{ ms}^{-1}

(d)

2.5 \text{ ms}^{-1}

[June 28, 2022 (II)]