a. vf^2=vi^2+2gh
vf=0, g=-9,8 solve for vi.
b. same equation as above, solve for a where g is.
c. Force*distance=1/2 m v^2
A 2.50 kg fireworks shell is fired straight up from a mortar and reaches a height of 110. m.
(a) Neglecting air resistance (a poor assumption, but we will make it for this example), calculate
the shell’s velocity when it leaves the mortar. (b) The mortar itself is a tube 0.450 m long.
Calculate the average acceleration of the shell in the tube as it goes from zero to the velocity found
in (a). (c) What is the average net force on the shell in the mortar? Food for thought: How does
this force compare to the weight of the shell?
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Thank you so much
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