Asked by kgaogelo
a bot throws a cricket ball witg an initial velocity of 5m.s from the edge of a tall building.it passes the edge of the building on its way down and strikes the ground below after 5seconds (neglect effects of friction. question1...how does the acceleration of the ball moving downwards compare with the upwards movement?calculate the time taken react the higher point.calculate the height the building.draw a position vs time graph inserting all known values.
Answers
Answered by
Henry
V^2 = Vo^2 + 2g*h
h = (V^2-Vo^2)/2g
h = (0-25)/-19.6 = 1.28 m. = Max. ht.
above bldg.
V = Vo + g*t
Tr = (V-Vo)/g = (0-5)/-9.8 = 0.51 s. =
Rise time.
Tf1 = Tr = 0.51 s. = Time to fall back to edge of bldg.
Tf2 = 5 = - Tr - Tf1=5-0.51 - 0.51=3.98 s.
Hb = Vo*t + 0.5a*t^2
Hb = 5*3.98 + 4.9*(3.98)^2 = 97.5 m. =
ht. of bldg.
h = (V^2-Vo^2)/2g
h = (0-25)/-19.6 = 1.28 m. = Max. ht.
above bldg.
V = Vo + g*t
Tr = (V-Vo)/g = (0-5)/-9.8 = 0.51 s. =
Rise time.
Tf1 = Tr = 0.51 s. = Time to fall back to edge of bldg.
Tf2 = 5 = - Tr - Tf1=5-0.51 - 0.51=3.98 s.
Hb = Vo*t + 0.5a*t^2
Hb = 5*3.98 + 4.9*(3.98)^2 = 97.5 m. =
ht. of bldg.
Answered by
Henry
T = Time in seconds.
h = Ht above gnd. in meters.
(T,h).
(0,97.5)
(0.51,98.8)
(1.01,97.5)
(5,0).
h = Ht above gnd. in meters.
(T,h).
(0,97.5)
(0.51,98.8)
(1.01,97.5)
(5,0).
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