How much weight did the boy put on the chair if his weight was 57 kg?

The force with which the boy’s weight acts on the chair can be calculated using the formula:
F = m * g, F – acting force, m – boy’s mass (m = 57 kg), g – gravitational acceleration (we take g = 9.8 m / s²).
Let’s calculate the force with which the boy’s weight acts on the chair:
F = m * g = 57 * 9.8 = 558.6 N.
Answer: The boy acts on the chair with a force equal to 558.6 N.