When a body of mass 1 kg travells with constant velocity and zero acceleration with no force acting on it and hits a wall in front of it, is the force exerted on the wallis 0 because f= ma 1 kg * 0m/s^2 = 0 ????
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It is not zero .
The force will act on the wall because of change of momentum of the ball after hitting the wall
after hitting the wall the velocity of the ball may decrease in some time so it gets some retardation and that decrease in speed is due to the force by wall.
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