Young Jeffrey is bored, and decides to throw some things out of the window for f

Question

Young Jeffrey is bored, and decides to throw some things out of the window for fun. But since he is also very curious, he decides to do so in a controlled way. Jeffrey takes a rock, his tennis ball, and one of his father's golf balls and sets them on the sill of an open window. Then he uses a flat board to carefully push them all out of the window at the same time. The 2nd story window is 13.0 feet above the ground, and all three objects hit the ground just 0.650 feet away from the base of the house at the same time, 0.899 seconds after they're dropped The rock hits with a thud and stays put, but the other two objects bounce. After another 0.674 seconds, the tennis ball reaches a maximum height of 7.31 feet, while the golf ball is 10.2 feet off the around and still rising. Both have travelled an additional 0.488 feet horizontally Calculate the magnitude of the average velocity of each object during these 1.57 seconds. Which object has the largest instantaneous velocity at the end of this time period? Number Largest Vinst? avg.rock lie between golf and tennis balls O Tennis ball Number Golf ball O Rock avg.golf Number avg.tennis

Explanation / Answer

Vavg= (Vf- Vi)/ change in t

Vi= 0 so the equation becomes Vavg= Vf/ change in time

Vavg- rock= square root of (Vx^2 + Vy^2)/ change in time

=square root of (0.65^2 +13.0^2)/(0.899+0.674)

= square root of (0.65^2 +13.0^2)/1.573 = 8.27 ft/s

Vavg- golf= square root of ((0.65+ 0.488)^2 + (13.0- 10.2)^2)/ 1.573 = 1.92 ft/s

Vavg- tennis= square root of ((0.65+0.488)^2 + (13.0- 7.31)^2)/ 1.573 = 3.69 ft/s

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

---

---

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