Preston Meadow's Height Enhancement Blog

Need help with projectile motion?

The question is: A rifle that shoots bullets at 460m / s fires at a target distance of 45.7m. If the center target is the same height as the barrel of the rifle, how high above the target that the rifle is pointed so that the bullet hits dead center? This is difficult because I'm not allowed to use the range formula. Without this, I do not know where to start, because the kinematic equations do not seem to help. Could someone help me please?

Fortunately, you do not need the range of the equation. Draw this – the rifle fires straight (horizontal) and the path of bullet bows down until she on target. If the gun fires at 460 m / s – then the ball will take a while to go the distance of 45.7 m (45.7/460) seconds if the bullet has so long that distance horizontally, which is the amount of time you have to * drop *. So .. the ball falls in love with (45.7/460) seconds Distance fallen = 1 / 2 * g * t ^ 2 = 1 / 2 * (9.8) * (45.7/460) ^ 2 What is the highest amount above the target of the gun should be placed.

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