Questions
A rifle shoots a bullet with a muzzle velocity of 400 ms-1 at a small target 400 m away. The height above the target at which the bullet must be aimed to hit the target is (g = 10 ms-2).
detailed solution
Correct option is B
Time taken by bullet to reach the target is Distance velocity = Distance ucosθ [ As θ is very small, cosθ=1 ] Time = Distance u=400400=1 s Vertical deflection of bullet is =12gt2=12×10×(1)2=5 mTalk to our academic expert!
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Assertion : When the velocity of projection of a body is made n times, its time of flight becomes n times.
Reason : Range of projectile does not depend on the initial velocity of a body.
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