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part a. A delivery drone, hovering at an altitude of 260. m above the ground, drops a package. ("dropped" means that it was stationary when released ). How long will it take to reach the ground? part b. What will be the velocity of the package the instant before it hits the ground?

part a A delivery drone hovering at an altitude of 260 m above the ground drops a package dropped means that it was stationary when released How long will it ta class=

Respuesta :

Given:

h= 260m (height)

a = 9.8 m/s^2 (acceleration due to gravity )

Apply:

• a)

h = 1/2 a t^2

Replacing:

260 = 1/2 (9.8) t^2

260 / (1/2 * 9.8 ) = t^2

t = √[260 / (1/2 * 9.8 ) ]

t = 7.28 s

• b)

Apply.:

Vf = vi + at

Vf = finale velocity

Vi = initial velocity ( rest ) = 0 m/s

Vf = -9.8 (7.28 ) = -71.34 m/s

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