A projectile has no motor/rocket on it, so all of its momentum is given to it as it is launched. An example of a projectile would be pen that you throw across a room.A rocket or missile does have a motor/rocket on it so it can accelerate itself while moving and so resist other forces such as gravity.

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Ramavatar Sharma · Accepted Answer

A projectile has no motor/rocket on it, so all of its momentum is given to it as it is launched. An example of a projectile would be pen that you throw across a room.A rocket or missile does have a motor/rocket on it so it can accelerate itself while moving and so resist other forces such as gravity.

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