A 2.79 kg fireworks shell is red from a mortar at an angle 12.7 from the vertical and reaches a height of 124 m. (a) Neglecting air resistance (a poor assumption, but we will make it for this example), calculate the shell's velocity (in m/s) when it leaves the mortar. (Enter the magnitude.) E m/s (b) The mortar itself is a tube 0.511 m long. Calculate the average acceleration (in m/sz) of the shell in the tube as it goes from zero to the velocity found in (a). (Enter the magnitude.) E m/sz (c) What is the average force on the shell (Favg) in the mortar? Express your answer in newtons and as a ratio to the weight of the shell (Wshell)' (Enter the magnitude.)