Heya!!
For calculate aceleration, lets applicate second law of Newton:
[tex]\boxed{F=ma}[/tex]
Δ Being Δ
F = Force = 85,5 N
m = Mass = 24,3 kg
a = Aceleration = ?
⇒ Let's replace according the formula and clear "a":
[tex]\boxed{a=85.5 \ N / 24.3\ kg}[/tex]
⇒ Resolving
[tex]\boxed{ a = 3.51 \ m/s^{2}}[/tex]
Result:
The aceleration is 3,41 meters per second squared (m/s²)
Good Luck!!