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  •  The initial speed of a bullet fired from a rifle is 630 m/s.  The rifle is fired at the centre of a target 700 m away at the same level as the target.  How far above the centre of t

 The initial speed of a bullet fired from a rifle is 630 m/s.  The rifle is fired at the centre of a target 700 m away at the same level as the target.  How far above the centre of the target the rifle must be aimed in order to hit the target ?

Option: 1

1.0 m


Option: 2

4.2 m


Option: 3

6.1 m


Option: 4

9.8 m


Answers (1)

As learnt -

y= x \tan \theta - \frac{gx^{2}}{24^{2}\\cos ^{2}\theta }

T = \frac{distance \:\:in \:\:x}{speed \:\:in \:\:x} \Rightarrow \frac{700}{630}\Rightarrow 1.1

x=4\cos \theta

y=4\cos \theta \cdot \tan \theta - \frac{gx^{2}}{24^{2}\cos ^{2}\theta }

h=\frac{1}{2} \:\: gt^{2} = \frac{1}{2}\times 10\times \left ( \frac{10}{9} \right )^{2} =  6.1 m

Posted by

Sumit Saini

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