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Answer :
The normal force equals (B) 245 N.
The normal force is the force exerted by a surface to support the weight of an object resting on it, acting perpendicular to the surface.
In this case, the child is sitting on a chair, so the normal force will equal the gravitational force acting on the child.
The gravitational force (weight) can be calculated using the formula:
Weight (W) = mass (m) × gravitational acceleration (g)
Where:
- m = 25 kg (mass of the child)
- g = 9.8 m/s² (acceleration due to gravity)
Substitute the values:
W = 25 kg × 9.8 m/s²
= 245 N
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