When a 250-kg boulder is acted upon by a net force of 1250 N, its acceleration is a1. When it is acted upon by a net force of 200 N, its acceleration is a2. What is the value of the ratio a1/a2?

Since F = m a and remains the same,

a1/a2 = F1/F2

a2 = a1*(F2/F1)