Question

What is the mass of a cannonball of a force of 2,500 N gives the cannon an acceleration of 200 m/s2?

Answer 1

$According to Newton's 2nd law of motion, Force = mass *acceleration.$                                                                                                                              $Mass = \frac{Force}{acceleration} = \frac{2500}{200} = 12.5kg.$.           Hence option B is correct. 

Answer 2

Force(F) = mass(m) * acceleration (a)
Here, F = 2500 N
a = 200 m/s²

Substitute their values into the expression, 
2500 = m * 200
m = 2500 / 200
m = 25/2
m = 12.5 Kg

In short, Your Answer would be Option B

Hope this helps!