Question

During firing ,soldier holds his rifle firmly to his shoulder imagine why?

Answer 1

BECAUSE WHEN HE SHOOT IT HAD A REACTION OPPOSITE TO ITS direction
as per the second law of neuton
every action has an equal and opposite REACTION
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Answer 2

because, according to newton's third law for every action there is same and opposite reaction. so while firing, the soldier hold the rifile firmly otherwise it makes a strong wound on soldier's face.