Is My Kinematics Problem-Solving Approach Correct?

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The discussion focuses on verifying the correctness of solutions to three kinematics problems involving projectile motion and tension in cables. The first problem involves calculating the time a ball hits the ground and its impact velocity after being fired from a height. The second problem requires determining the tension in two cables supporting a 28kg sign. The third problem addresses the acceleration of a system with two masses on an incline and the tension in the connecting string. Participants are encouraged to review the provided solutions and processes for accuracy.
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I was wondering, given my solutions and the problem statements; if someone could look over my work to see if there are any incorrect solutions/processes.

Thanks!
 

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Problem 1

A ball is fired from a height of 3.0m above the ground, with a speed of 13m/s and an angle of 22 below horizontal. At what time does the ball hit the ground? What is the impact velocity?

Problem 2

A 28kg sign is suspended by two massless cables. Find the tension in each.

Problem 4

In the setup shown, m1 = 0.30kg, m2 = 0.45kg and theta = 11. Also, between the first block and incline, mu = 0.40. Assume the system moves so that the first block slides up the incline. What is the acceleration of the system? What is the tension in the string?
 

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