(10% ) Problem 11: There are two balls. The first ball is hurled upward with ini
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Question
(10% ) Problem 11: There are two balls. The first ball is hurled upward with initial velocity vi = 1.4 m/s at h = 7 m above the ground. After 5 s, the other ball is hurled downward with initial velocity of -v, from the same height. Both of the balls move until they hit the ground. Oth 8% Part (a) Defining the positive direction going upward, what is the acceleration of these two balls in m/s 8% Part (b) what is the displacement of these two balls in meters? Grade Summary Deductions 10% Potentia 90% 7 8 9 HOME sin) cotan asinO atanacotan sin0 cosh tanh cotanhO+ tand) ( Attempts remaining: ( 10 % per attempt) detailed view 10% END Degrees Radians BACKSPACE DL CLEAR lint I give up! Hints:- ' deduction per hint. Hints remaining: Feedback:--deduction per feedback. 8% Part (c) Express the final velocity of the first ball vif-Just as it hits the ground, in terms of vi. Ay, and a 8% Part (d) Calculate the numerical value of vlf in m/s. 8% Part (e) Express the final velocity of the second ball, vr.just as it hits the ground, in terms of vi. Ay, and a 8% Part (f) Calculate the numerical value of v2fn m's. 8% Part (g) Express an equation relating vif in terms of v25, according to the above calculation. 8% Part (h) Express the time interval that the first ball is in the air, , in terms of vi, vif, and a. 8% Part (i) Calculate the numerical value of Ati in seconds. 8% Part Express the time interval of the second ball's motion. Ang, in terms of-vi, v2f, and a. 8% Part (k) Calculate the numerical value of At2 in seconds. 8% Part (1) Calculate the difference Ati -At" in seconds. 8% Part (m) Based on the above calculation, which ball hit the ground first, the first or the second? 18 Fnert TAExplanation / Answer
The displacement is - 7 m.
As you can see taking origin at ground where the balls will hit the initial positions of ball are 7 m and final positions are 0 m.
Hence displacememt will be change in position i.e. (Final position - Initial position) = (0 - 7) m = - 7 m which will be your answer.
If you need solution to further parts please comment below.
But first try to solve them by yourself using Newton's laws of motion.
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