Answer:
Step-by-step explanation:
This is very straightforward, except that we need the mass in kg and it's in g. So we have to convert first, using the fact that there are 1000g in 1 kg:
and now we're ready to solve your problem.
F = ma and
120 = .200a so
a = 6.0 × 10² (which is 600 m/s/s)