Question

please answer this question​

Answer 1

Answer:

Step-by-step explanation:

Height of the plane (h) = 1000m

let speed of plane be x m/s

then distance it covers= 10sec* Xm/s = 10x m

h$\frac{h}{point of observation(d+10x)}$ = tan30degrees

h$\frac{h}{distance between new position of plane and point of observation (d)}$ = tan60degrees

h$\frac{10x+d}{h}$ = cot30

h$\frac{d}{h}$ = cot60

cot30-cot60= 10x/h

root3- 1/root3 = 10x/1000

2/root3 + x/100

x = 200/root3 m/s