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lngPhysics:CH 04 HW-Google Chrome Es seguro htps://session. masteringphysics.com/myct/itemView?assignmentProblemID-91015347 CH 04 HW PSS 4.1 Projectile Motion Problems Masteri Part C Learning Goal: Find the height y, from which the rock was launched. Express your answer in meters to three significant figure To practice Problem-Solving Strategy 4.1 for projectile motion problems. A rock thrown with speed 10.5 m/s and launch angle 30.0 (above the horizontal) travels a horizontal distance of d = 19.0 m. before hitting the ground. From what height was the rock thrown? Use the value g- 9.800 m/s2 for the free-fall acceleration View Available Hint(s) 2.44 Submit Previous Answers X Incorrect; Try Again; 3 attempts remainina

Explanation / Answer

here,

initial speed , u = 10.5 m/s

theta = 30 degree

let the time taken to hit the ground be t

d = u * cos(theta) * t

19 = 10.5 * cos(30) * t

solving for t

t = 2.1 s

the time taken is 2.1 s

the height from which the rock is dropped , h = - u * sin(theta) * t + 0.5 * g * t^2

h = - 10.5 * sin(30) * 2.1 + 0.5 * 9.81 * 2.1^2 m

h = 10.6 m

the height from which the rock is launched is 10.6 m

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