Hey can anyone help me solve these questions for me please? The answer is alread

Question

Hey can anyone help me solve these questions for me please?

The answer is already submitted there but I really want to know how you get that answer. Please help me someone...

I really want to know how you solve these problems...

Thank you so much in advance!!!

Homework 04 1 & In figure, a ball is thrown up onto a roof and lands 3.99 s later at heighth the Marks: = 19.7 m above the release levelThe ball's path just before landing is angled 10/10 at 0 = 57.1° with the roof. What was the angle (relative to horizontal) of the balls initial velocity? I 0 0 0 DIDO Answer: 68, 9 Correct Marks for this submission: 10/10. 2 & A particle moves counterclockwise in a circle of radius R = 20.8 m about the origin. At t = 0, the particle is at 60° above the positive X-axis and its Marks : 10/10 acceleration is a = -0.417 J mvs, as shown in the figure. The particle slows down at a constant rate until it comes to a stop. How much time (in seconds) does it take for the particle to come to a stop? Answer: 13.1 $ Correct Marks for this submission: 10/10.

Explanation / Answer

Applying second equation of motion in vertical direction

h = ut - 0.5gt^2

19.7 = u*3.99 - 0.5*9.8*3.99^2

3.99u = 19.7 +78

u = 97.7/3.99 = 24.486 m/s......this initial vertical velocity

final vertical velocity v= 24.486 - 3.99*9.8 = -14.616 m/s

final horizontal velocity = 14.616/tan57.1 degree = 9.456 m/s

since horizontal velocity remians constant,

initial angle theta = arctan(24.486/9.456)

= 68.9 degree

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