Question

An aeroplane is flying horizontally at a height of 490m with a velocity of 150m/s a bag containing food is to be dropped to the jawans on the ground how far from them should the bag be dropped so that if directly reaches them

Answer 1

T = sqrt(2H / g)
= sqrt(2 * 490 / 9.8)
= 10 seconds

x = uT
= 150 * 10
= 1500 m
= 1.5 km


The bag should be dropped at the instant when aeroplane is 1.5 km behind the jawans and not at exactly on their heads.