First slide

Projection Under uniform Acceleration

Question

An aeroplane is flying horizontally at a height of 490 m with a velocity of 150 ms^-1. 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 it directly reaches them ?

Easy

A

1000 m
B

1500 m
C

750 m
D

2000 m

Solution

$\begin{array}{l} t = \sqrt{\frac{2 h}{g}} = \sqrt{\frac{2 .490}{9 .8}} = 10 s \\ ∴ R = 150 \times 10 = 1500 m \end{array}$

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