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Motion In A Plane

Question
CBSEENPH11026113

The maximum range of a gun on horizontal terrain is 16 km if g=10m/s2. What must be the muzzle velocity of the shell?

  • 200 m/s

  • 100 m/s

  • 400 m/s

  • 300 m/s

Solution

C.

400 m/s

The velocity with which a bullet or shell leaves the muzzle of a gun.
 
We  know that in projection of the particle for maximum range, θ = 45o
 
Now maximum rangeR =μ2sin 2θgR=μ2 sin 90og        sin 90o =1μ =Rg               .....(1)Given :- Rmax = 16 km= 16×103 mg = 10 m/s2Now from equation(1)μ =16×103×10=400 m/s