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Question

A block of mass 1 kg starts moving at t=0 with speed 2 m/s on rough horizontal surface with coefficient of friction 0.2. A horizontal force F is applied in the same direction of velocity which varies with time shown in figure (b). Find the speed of particle at t=3 s (g=10 m/s2)

A
1 m/s
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B
zero
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C
5 m/s
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D
2 m/s
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Solution

The correct option is B zero
Friction force = 0.2×1×10=2 N.
At t=2 s block comes to rest and then F< friction. So, speed at t=3 s is zero.
(b)

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