A bullet weighing 20 g at the moment of impact with the wall at an angle of 90° had a speed of 300 m/s. Having gone some distance into the wall, it stopped after a time of 5·10-4 s. Determine: 1) The average resistance force of the wall Fc and the distance l through which the bullet penetrated; 2) at what speed vk the bullet will fly out of the wall if the wall is 5 cm thick.
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