Question

An aeroplane is flying at a height of 1960 m in horizontal direction with a velocity of 360 km/hr. When

it is vertically above the point A on the ground, it drops a bomb. The bomb strikes a point B on the

ground, then the time taken by the bomb to reach the ground is -

(a) 20 2 sec (b) 20 sec

(c) 10 2 sec (d) 10 sec​

Answer 1

Answer:

Explanation:

As the plane has only perpendicular velocity, it whould not change the time take by the bomb to reach the ground even if it is thrown from a stationary object in the air. So, we have gravity only that is acting in the ver tical directio:

using s=ut+1/2at^2 we get it takes 20 sec to reach the ground

Answer 2

given d=1960m

s=100m/s

so t=d/s so we get

20 sec