Question

50) A body of mass 40 kg resting on rough horizontal surface is subjected to a force P which is just enough to start the motion of the body. If Ms = 0.5, Mk = 0.4, g= 10 m/s2 and the force P is continuously applied on the body, then the acceleration of the body is: 1)Zero 2)1 m/s² 3)2 m/s² 4)2.4 m/s²​

Answer 1

Explanation:

Since P is the force which is just enough to start the motion of the body,

P=μ

s

N=μ

s

mg

When the body moves under this force, the net force on body is given by

F=ma=P−f

⟹ma=μ

s

mg−μ

k

N

=m(μ

s

−μ

k

)g

⟹a=(μ

s

−μ

k

)g

=(0.5−0.4)(10)m/s

2

⟹a=1m/s

2

2 is righit

Answer 2

Answer:

Since P is the force which is just enough to start the motion of the body,

P=μ

s

N=μ

s

mg

When the body moves under this force, the net force on body is given by

F=ma=P−f

⟹ma=μ

s

mg−μ

k

N

=m(μ

s

−μ

k

)g

⟹a=(μ

s

−μ

k

)g

=(0.5−0.4)(10)m/s

2

⟹a=1m/s

2

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Explanation:

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