a kite is 24m high and there are 25 metres of cord out. if the kite moves horizontally at the rate of 36 km per hour directly away from the person who is flying it how fast is cord out
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Answer:
Correct option is
B
4 km/hr
x
2
+y
2
=r
2
2x
dt
dx
+2y
dt
dy
=2r
dt
dr
Interchanging positions of x and y,
400
↑
2x
5km/hr
↑
dt
dx
+2y
0
↑
dt
dy
=
500
↑
2r
?
↑
dt
dr
∴2×
1000
400
=2×
1000
500
dt
dr
dt
dr
=
5
4
×5
dt
dr
=4km/hr
Step-by-step explanation:
so finally answer is 4km/hr.
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