Hey guys, hello. There is a system belongs in internet called LON-CAPA, and my teacher told that homeworks are done via that system. So I logged in, the questions are not that difficult to solve. But system doesn't accept some of my answers which i'm so sure that being true. So I'm gonna write 3 easy questions for you, I'm just wondering if I did a mistake or not. Here we go. 1 - The position of an object as a function of time is given as x = At3 + Bt2 + Ct + D. The constants are A = 2.31 m/s3, B = 1.07 m/s2, C = -4.91 m/s, and D = 3.45 m. Q-1 What is the acceleration of the object at t = 0.357 s? (MY ANSWER IS 7,088 m/s^2) 2- A ball is thrown straight upward in the air at a speed of 17.1 m/s. Ignore air resistance. Q-2.1 What is the maximum height the ball will reach? (MY ANSWER IS 14,92m) Q-2.2 How long will it take to reach 2.31 m above its initial position on the way down? (MY ANSWER IS 3,34s) Thank you guys for you answers already!