Question

While landing on the airpot. pilot in the jet plane makes an angle of depression of ${20}^0$. Average speed of the plane is 200km/hr. Plane reached the ground after 54 seconds. Find the maximum height at which the plane was, when he started landing.($\sin {20}^0=0.342$)

• A. $4.026$km
• B. $1.026$km
• C. $7.006$km
• D. None of these

Answer 1

The correct option is B $1.026$km

Distance =$\frac{54}{3600}\times 200=3km$
Max height =Distance $\sin {20}^o$

$=3\times 0.342$

$=1.026$