Please see attached image for problem. I solved question (a), but I am strugglin

Question

Please see attached image for problem. I solved question (a), but I am struggling with (b)

a) An indestructible bullet 1.85alis fired straight though a board that is 10.0em thick. The bullet strikes the board with a speed of 426m's and eanerges with a speed of 300ms What is the average accleationof the bullet as it passes though the board? 4.57x10 mis 2 You are correct. Computer's answer now shown above Your receipt is 148-5648 b What is the total time that the bullet is in contact wirh the board? 5e-4s Submit Answer Incorrect Tres 4'6 Prcsions Trics

Explanation / Answer

B) from equation of motion

v = u + a t

300 = 426-45738*102*t

t = 2.75*10-5 sec

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