Asked by Hannah
A stone is thrown upwards from the roof with a velocity 15ms^-1 at an angle 30degree to the horizontal. The height of the building is 40m.calculate the magnitude of the velocity of the stones before it strikes the ground.
Answers
Answered by
Henry
Yo = 15*sin30 = 7.5 m/s. = Ver. component of initial velocity.
Y^2 = Yo^2 + 2g*h = 0.
h = -Yo^2/2g = -(7.5)^2/-19.6 = 2.87 m.
above the roof.
V^2 = Vo^2 + 2g*(h+40) = 0 +19.6*42.87 = 840.25
V = 29 m/s.
Y^2 = Yo^2 + 2g*h = 0.
h = -Yo^2/2g = -(7.5)^2/-19.6 = 2.87 m.
above the roof.
V^2 = Vo^2 + 2g*(h+40) = 0 +19.6*42.87 = 840.25
V = 29 m/s.
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