Question

An aeroplane is flying horizontally with a velocity of 216 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground at point B. The distance AB is (ignoring air resistance)

• A. 1200m
• B. 0.33 km
• C. 3.33km
• D. 33 km.

Answer 1

Answer: (A)

1200m

Answer 2

: Horizontal velocity of aeroplane, $u=\frac{216\times 1000}{60\times 60}=60\,m/s$ Time of flight, $T=\sqrt{\frac{2s}{g}}=\sqrt{\frac{2\times 1960}{9.8}}=20\,s$ Horizontal range, $=AB=nT$ $=60\times 20=1200m$ .