Heya!!
For calculate aceleration, lets applicate second law of Newton:
Δ Being Δ
F = Force = 78,3 N
m = Mass = 24,5 kg
a = Aceleration = ?
⇒ Let's replace according the formula and clear "a":
⇒ Resolving
Result:
The aceleration is 3,19 meters per second squared (m/s²)
Good Luck!!