Normally, jet engines push air out the back of the engine. resulting in forward

Question

Normally, jet engines push air out the back of the engine. resulting in forward thrust, but commercial aircraft often have thrust reversers that can change the direction of the ejected air, sending it forward. When might these thrust reversers be useful in practice? If the ejected air is directed forward then thrust force is backward. This might be desirable to slow the plane down. If the ejected air is directed downward, the thrust force is up. Jets can take of vertically without needing a runway this way. If the ejected air is directed forward then thrust force is backward. This might be desirable to accelerate the plane. If the ejected air is directed forward then thrust force is backward. This might be desirable to conserve the speed of the plane.

Explanation / Answer

In civil aircrafts, reverse thrust is an optional method of braking and is only used when on the ground. Once the aircraft touches down, the pilot deploys reverse thrust. for military aircrafts, reverse thrusts enable them for deep descents.reverse thrust is used when extra stopping power needed. ideally air should be directed in forward direction in reverse thrust.

so option A is correct

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