. A ball of mass 0.05 kg travelling at 4 ms-hits a wall
and rebounds without any change in its speed. If the
ball remain

by

. A ball of mass 0.05 kg travelling at 4 ms-hits a wall
and rebounds without any change in its speed. If the
ball remains in contact with the wall for 0.01 s, then
the force exerted by the ball on the wall is
1) 0.05N
2) 0.0IN
3) 50 N
4) 40 N​

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