Question

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which statement is true regarding a jet moving at a constant speed of 450 m.p.h. in straight and level flight.
there is no net force acting on the jet.
with no net force, the jet would lose altitude.
there is a net force acting on the jet, but only in the upward direction - otherwise it could not maintain flight.
with no net force, the jet would eventually slow down.

Explanation:

According to Newton's first - law of motion, an object in uniform motion (constant speed in a straight line) has no net force acting on it. The jet is moving at a constant speed in straight and level flight, so the forces acting on it (such as lift, weight, thrust, and drag) are balanced, resulting in no net force.

Answer:

There is no net force acting on the jet.