Q.

How many Newtons make 1 kg.wt?


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a

4.9 N

b

98 N

c

49 N

d

9.8 N 

answer is D.

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Detailed Solution

9.8 N is equal to 1 kg.wt.
The weight of an object is the force with which the gravitational force pulls it. A Newton, which is equal to kg m/s2, is the SI unit of weight (N). The formula W=mg, which denotes weight as the gravitational force exerted on a mass, can be written as kg m/s2, which is equivalent to N. One kilogram weight is the force that the earth applies to a mass of one kilogram.
An object's weight, W, is equal to its mass (m) times its acceleration due to gravity (g),
W=mg
Therefore, the weight of a mass of 1 kg will be:
If m=1 kg
= 1 ×9.8
      = 1 kg.wt
We are aware that,
 1 kg m/s2 = 1 N
1 kg.wt = 9.8 N 
 
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