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Q.

A block of mass m is pulled by a constant power P placed on a rough horizontal plane. The friction co-efficient between the block and surface varies with its speed v as μ=11+v. The acceleration of the block when its speed is 3 m/s will be

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a

P3m

b

P3m+g2

c

g2

d

P3m-g2

answer is A.

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Detailed Solution

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P=Fv

F=P3 and μ=13+1=12

Question Image

f=μN=12mg 

F-f=ma

∴a=P3-12mgm

a=P3m-g2

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