Find Muzzle speed

  • #1

Homework Statement


Find the muzzle speed of a gun whose maximum range is 24.5 km.


Homework Equations


R = V02sin2angle/g


The Attempt at a Solution


How do I find the angle?

Also can you check what I did wrong in this one?
A projectile is fired at a speed of 840 /sec at an angle of 60 degree. How long will it take to get 21 km downrange?
change in X = V1t
21,000/840 = t
t=25 sec
But the right answer is 50 s
 

Answers and Replies

  • #2
The angle for maximum range should be obvious - think what happens if you shoot straight up or straight horizontal?
 

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