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Question

A force produces an acceleration of 5.0 cms2 when it acts on a body of mass 20 g. The force in newton is:

A
2×103N
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B
4×103N
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C
1.0×103N
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D
5×103N
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Solution

The correct option is C 1.0×103N

Given mass, m=20 g and acceleration , a=5.0 cms2
Let the force be F.
We know, F=ma=20×5=100 gcms2=100 Dyne.
The cgs unit of force is gcms2, also known as Dyne.
The relationship between cgs unit Dyne and SI unit Newton is
1 Dyne=105N
F=100×105=1×103N

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