A 2.50 kg fireworks shell is fired straight up from a mortar intending to reach 110m. How much downward force is created to propel that shell upwards to it's intended target?

Question

A 2.50 kg fireworks shell is fired straight up from a mortar intending to reach 110m.  How much downward force is created to propel that shell upwards to it's intended target?

Steve · Answer

I think you need to specify more. F=ma, but we don't know how long it took to reach its ballistic speed, so we have no idea of the initial acceleration.