Calculating Force and Velocity of a Launched Water Balloon

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To calculate the force and velocity of a launched water balloon, start by drawing a free body diagram to identify all acting forces. Given an upward force of 12N on a 400g balloon lasting 0.15s, the net force can be calculated by subtracting the weight of the balloon from the applied force. Use Newton's second law to determine acceleration and then calculate the final velocity using the formula v = u + at. Finally, apply kinematic equations to find the maximum height the balloon reaches after launch. Understanding these steps will clarify the problem-solving process for the scenario.
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I don't know if people on these forums usually do this, but I have a question and nobody is really around to help, ok, here goes,

An elastic puts an upward force of 12N on a 400g balloon. The force lasts 0.15s.

a. draw the free body diagram
b. calculate net force and acceleration
c. what is the velocity of the water balloon when launched from the elastic
d. how high does it go?

I am very stumped on this one, so any help would be greatly appreciated.
 
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What is the first step?

Draw a free body diagram. List all the forces acting on the object.
 

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