The rock will hit the ground after 3.54 seconds.
Step-by-step explanation:
In this question the rock experiences a free fall with only gravity acting on it. The height of the fall is 202 ft and initial velocity is 0, thus the distance the object falls, h, is given by;
h= 1/2 gt² where t is time taken for the rock to hit the ground and g is acceleration due to gravity given as g=9.8 m/s²
First change feet to meters: divide the distance in feet by 3.281
202/3.281 =61.57 m
h=1/2 gt²
61.57= 1/2 * 9.8 * t²
61.57=4.9 t²
61.57/4.9=t²
12.57=t²
√12.57=t
3.54 sec=t
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Free Fall : brainly.com/question/2607086
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Step-by-step explanation:
csc²u − cos u sec u
csc²u − 1
cot²u
the answer is 36.36 but the closest to it is 37
We know that
[surface area of the pyramid]=area of the base+4*[area of one lateral triangle]
area of the base=14*14------> 196 cm²
area of one lateral triangle=b*h/2
b is the length side of the square
b=14 cm
h is the slant height
h=15 cm
area of one lateral triangle=14*15/2-----> 105 cm²
[surface area of the pyramid]=196 cm²+4*[105 cm²]-----> 616 cm²
the answer is
616 cm²
Answer D
Step-by-step explanation: