(7%) Problem 7: There are two balls. The first ball is thrown upward with initial velocity v = 3.4 m/s at h = 7 m above the ground. After 5 s, the other ball is thrown downward with initial velocity of -v; from the same height. Both of the balls move until they hit the ground. -V. i V A 8% Part (a) Defining the positive direction going upward, what is the acceleration of these two balls in m/s? a = E4 96 HOME sin() cos() tan() ( 7 8 cotan() asin() acos() 5 acotan() atan() cosh() tanh() cotanh() sinh() * 1 2 3 - + - 0 END Degrees Radians VO BACKSPACE DEL CLEAR Grade Summary Deductions Potential Submissions 0% 100% Attempts remaining: 40 (0% per attempt) detailed view Hints: 0% deduction per hint. Hints remaining: 1 Submit Hint Feedback I give up! Feedback: 3% deduction per feedback. A 8% Part (b) What is the displacement of these two balls in meters? A 8% Part (c) Express the final velocity of the first ball vf, just as it hits the ground, in terms of vi, Ay, and a. A 8% Part (d) Calculate the numerical value of vf in m/s. A 8% Part (e) Express the final velocity of the second ball, v2f, just as it hits the ground, in terms of v, Ay, and a A 8% Part (f) Calculate the numerical value of V2f in m/s. 8% Part (g) Express an equation relating V1f in terms of v2f, according to the above calculation. 8% Part (h) Express the time interval that the first ball is in the air, At in terms of v, V1f, and a. A 8% Part (i) Calculate the numerical value of At in seconds. A 8% Part (j) Express the time interval of the second ball's motion, At2, in terms of -v, V2f, and a. A 8% Part (k) Calculate the numerical value of At2 in seconds. A 8% Part (1) Calculate the difference At - At in seconds. A 8% Part (m) Based on the above calculation, which ball hit the ground first, the first or the second?