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 ?
- 1.0 m
- 4.2 m
- 6.1 m
- 9.8 m
The Correct Option is C
Solution and Explanation
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Concepts Used:
Motion in a Plane
It is a vector quantity. A vector quantity is a quantity having both magnitude and direction. Speed is a scalar quantity and it is a quantity having a magnitude only. Motion in a plane is also known as motion in two dimensions.
Equations of Plane Motion
The equations of motion in a straight line are:
v=u+at
s=ut+½ at2
v2-u2=2as
Where,
- v = final velocity of the particle
- u = initial velocity of the particle
- s = displacement of the particle
- a = acceleration of the particle
- t = the time interval in which the particle is in consideration