Answer:
30
Step-by-step explanation:
Complementary angle to B = 90 - 60 = 30
K.E=0.5mv^2
GPE=mgh
The child has both K.E and GPE


g is taken as 9.81
You first separate the triangle from the rectangle. Then multiply one side be one side.
Answer:
(D)
Step-by-step explanation:
From the figure, we have
The coordinates of the point F are: (-4,1).
The coordinates of the point G are: (0,-2)
The coordinates of the point J are: (0,4) and
The coordinates of the point H are: (-4,-2).
Now, the slope of the line FG is :



And, the slope of the line HJ is:



Now, 

which is not possible, thus They are not perpendicular because their slopes are not negative reciprocals.