Hey all, I know this is an easy problem, but Mastering Physics is so irritating

Question

Hey all, I know this is an easy problem, but Mastering Physics is so irritating and I'm not sure if I'm doing it wrong, or if I'm just entering in the answer wrong. A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 130 m/s and it is accelerating at 19 m/s^2. At this instant, the rocket's mass is 59 kg and it is losing mass at the rate of 0.55 kg/s as it burns fuel.What is the net force on the rocket? Hint: Newton's second law was presented in a new form in this chapter. Only TWO sig figs can be in the answer So I calculated the net force as (130 m/s)*(.55kg/s)+(19m/s^2)*(59kg) and got an answer of 1200. Why am I wrong?

Explanation / Answer

USE THIS equation Product rule: d(mv)/dt = mdv/dt + vdm/dt.

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