(7%) Problem 9: A ball is thrown from a rooftop with an initial downward velocit

Question

(7%) Problem 9: A ball is thrown from a rooftop with an initial downward velocity of magnitude vo-29 m/s. The rooftop is a distance above the ground, h-38 m. In this problem use a coordinate system in which upwards is positive. V. Otheexpertta.com 33% Part (a) Find the vertical component of the velocity, vfy, in meters per second, with which the ball hits the ground. 33% Part (b) If we wanted the ball s final speed to be exactly 273 ms, from what height, h n (in meters), would we need to throw it with the same initial velocity? 33% Part (c) If the height is fixed at 38 m, but we wanted the ball's final speed to be 327 ms what would the vertical component of the initial velocity Viy need to be, in meters per second? Grade Summary Deductions Potential 100% sinO cosO tan() | | ( Submissions

Explanation / Answer

(A) vf^2 - vi^2 = 2 a d

vf^2 - 2.9^2 = 2(-9.8)(-38)

vf = 27.44 m/s

vfy = - 27.44 m/s (as it is downwards)

(B) 27.3^2 - 2.9^2 = 2(9.8)(h)

h = 37.5 m

(C) 32.7^2 - v0^2 = 2(38)(9.8)

v0 = 18 m/s

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.