In a movie stunt, Jennifer has to jump from one roof onto another roof, located

Question

In a movie stunt, Jennifer has to jump from one roof onto another roof, located below. The buildings are separated by a distance of 2.5 m. The horizontal initial speed of Jennifer is 4.1 m/s. What is the difference in height between the two buildings? 15) Justina and Shauna throw identical rocks off a tall building at the same time. Justina throws her rock straight downward. Shauna throws her rock downward and outward such that the angle between the initial velocity of the rock and the vertical is 30 degrees. Shauna throws the rock with a speed twice that of Justina?s rock. Which rock hits the ground first (assume the ground near the building is flat)? 16) Alex casts her bait into the river at an angle of 32degree. As the line unravels, she notices that the bait and hook reach a maxim urn height after l.3s. What vas the initial velocity she launched the bait with? 17 extra credit) A cannon directed by Christine straight upward launches a ball with initial speed v. The ball reaches a maximum height h in a time t. Then, the same ca is used to launch a second ball straight upward at a speed 3v. In terms of h and t, w second ball reaches and how long does it take to reach that

Explanation / Answer

let Vo is the initial velosity of rock thrown by Justina.

so, y-component of initial velocty of rock thrown by Justina = vo

velocity of rock thrown by Shauna = 2*vo

so, y-component of initial velocty of rock thrown by Sauna= 2*vo*cos(30)

= 2*vo*cos(30)

= 2*vo*sqrt(3)/2

= sqrt(3)*vo

= 1.732*vo

clearly,

y-component of initial velocty of rock thrown by Sauna > y-component of initial velocty of rock thrown by Justina

so, rock thrown by sauna reaches the ground first.

option A is the correct answer.

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