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1. A model rocket weighs 5.4 N.

a) What is its mass?

b) What applied force makes it accelerate upward at 13.0 m/s

^{2}?

Okay, so I did 5.4/9.8 to get mass which is 0.55 kg right?

How do I do b?

Then:

2. A space probe and rocket weigh 88,888 N. the applied force propelling the rocket is 3.0 x 10

^{6}N. Determine:

a) the mass of the rocket and space probe.

b) the upward acceleration of the rocket and space probe.

c) the velocity of the rocket 15 seconds after lift off.

So... I got a by going 88888/9.8 = 9070.20 kg

I don't know what to do now.