To find the force needed for Zeke to accelerate at 0.8 m/s², you can use Newton's second law of motion:
\[ F = m \cdot a \]
where:
- \( F \) is the force,
- \( m \) is the mass,
- \( a \) is the acceleration.
Here, Zeke's mass \( m = 50 \) kg and the acceleration \( a = 0.8 \) m/s².
Now, plugging in the values:
\[ F = 50 , \text{kg} \cdot 0.8 , \text{m/s}^2 = 40 , \text{N} \]
So, the required force is 40 N.
The correct answer is a) 40 N.