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2/162 A fireworks shell P fired in a vertical trajectory has
a y-acceleration given by ay = -g -ku², where the
latter term is due to aerodynamic drag. If the speed
of the shell is 15 m/s at the instant shown, deter-
mine the corresponding values of r, r, ", 0, 0, and 0.
The drag parameter k has a constant value of
0.01 m-¹
200 m
100 m

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