Answer:
10,000 m/s²
Explanation:
If we say the +x direction is away from home plate, then the initial velocity is -40 m/s and the final velocity is +60 m/s.
Acceleration is the change in velocity over change in time:
a = Δv / Δt
a = (60 m/s − (-40 m/s)) / 0.01 s
a = 10,000 m/s²