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When no friction is involved, what can an outside force do to a moving object?

Anothing
Bchange the object's speed only
Cchange the object's direction only
Dchange the object's speed or direction

Verified Answer :

AL2006

When friction IS present, it's possible that if the outside force
isn't strong enough or is in the wrong direction, then it might
have no effect on the object's motion.

But when NO friction is involved, an outside force MUST change
the object's speed or direction.  It can't help it.

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