Answer:
5.1 kg
Explanation:
You want to know the mass of a toy if acceleration due to Earth's gravity results in a force of 50 N being applied to the toy.
Force
The relevant relation between force, mass, and acceleration is ...
F = ma
m = F/a = (50 N)/(9.8 m/s²) ≈ 5.1 kg
The mass of the toy is about 5.1 kg.
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Additional comment
If the only force on the toy is gravity, the time it takes to fall a distance d is ...
t = √(2d/g)
For a distance of 2.5 m, that air time is ...
t = √(2·2.5 m/9.8 m/s²) ≈ 0.714 s . . . . not 1 second.
For the toy to take 1 s to fall 2.5 m, the acceleration is 5 m/s², not 9.8 m/s².
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