JEE Main 2014 · 11 Apr · Shift 1 · Physics Q2

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PhysicsSingle correct+4 / -1Question 2 of 90

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

Answer and worked solution

Official answer: C

The flight time is $t=\frac{700}{630}=1.11$ s. In that time the bullet falls $\frac12gt^2=\frac12(9.8)(1.235)\approx6.1$ m, so the rifle must be aimed that far above the centre.

Topics:Projectile motion

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JEE Main 2014 · 11 Apr · Shift 1, Physics question 2