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The doctrine of projectiles demonstrated and apply'd to all the most useful problems in practical gunnery : to which is added, the description and use of a new mathematical instrument, together with serveral curious properties of projectiles never before publish'd / by William Starrat
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Of Simple Motion. 7

iique Direction, the Change will beobliquely; but still the Acceleration,Retardation or Obliquity, will be inProportion to die new impressedForce. This Law will be more strict-ly demonstrated in Theorem ist. orcompound Motion.

SCHOLIUM i.

Since a Body can neither give nosdestroy its own Motion, nor alterits Celerity, the Momentum, or Forcewherewith it moves, must still be e~qual to the moving Force impressed >and since Extension or Figure, canno way affect Motion, in pure Space,there is nothing in Bodies, that canrequire different Forces, to movethem with equal Celerities, but theirdifferent Quantities of Matter.

Let

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