The velocity of a bullet hitting the board is 600 m / s and the duration is 0.001 S & nbsp; the velocity of a bullet passing through the board is 100 m / s. suppose that the bullet passing through the board is a uniform deceleration motion, try to find: (1) the acceleration of the bullet passing through the board. (2) the thickness of the board

The velocity of a bullet hitting the board is 600 m / s and the duration is 0.001 S & nbsp; the velocity of a bullet passing through the board is 100 m / s. suppose that the bullet passing through the board is a uniform deceleration motion, try to find: (1) the acceleration of the bullet passing through the board. (2) the thickness of the board

(1) When the bullet passes through the board and decelerates uniformly, V0 = 600m / s, v = 100M / s, t = 0.01s, then the acceleration a = V − v0t = - 5 × 105m / S2