Answer :
Final answer:
The normal force acting on a child of mass 25 kg sitting on a chair is equal to the child's weight. It can be found by multiplying the mass by the acceleration due to gravity, resulting in a normal force of approximately 245 N. The Correct option is C
Explanation:
The normal force acting on a child sitting still on a chair is equal to the weight of the child, assuming there is no vertical acceleration. This normal force can be calculated using the formula:
N = m × g,
where N is the normal force, m is the mass of the child, and g is the acceleration due to gravity. For a child with a mass of 25 kg:
N = 25 kg × 9.81 m/s²
N = 245.25 N
Therefore, the normal force acting on the child is approximately 245 N, which corresponds to option c.
