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A rocket has been in the air for 4 seconds from the instant it was launched to when it hit the ground. The force of gravity can be rounded to 10(m/s). Using the method a= delta v / delta t, find the initial velocity for the rocket.

This is just after launch so I see no need to worry about any force acting on the rocket while it's in the air other than gravity pulling it down.

Homework Statement I need to find the initial velocity of a rocket using the method a=\Deltav/\Deltat. Given a situation where \Deltat = 4 seconds. The force of gravity in this case is -10(m/s) Homework Equations After I get \Deltav how do I turn that into the initial velocity? The...