Applicate formula:
Vf² = Vo² + 2ad
Clearing a:
a = (Vf² - Vo²) / 2d
Replacing:
a = ((20 m/s)² - 0 m/s)²) / 2 * 2 m
a = 400 m²/s² / 4 m²
a = 100 m/s²
The aceleration is 100 m/s²
3.4m questions
4.4m answers