need help with this. A bullet is fired horizontally with an initial velocity of

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need help with this.

A bullet is fired horizontally with an initial velocity of 800 m/s at a target located 500 m from the rifle. How much time is required tor the bullet to reach the target? How far does the bullet fall in this time? A ball rolls off a shelf what a horizontal velocity of 15 m/s. At what horizontal distance from the shelf does the ball land if it takes 0.4 s to reach the floor? A ball rolls off a table with a horizontal velocity of 16 m/s. If it takes 1.5 s for it to reach the floor: What is the vertical component of the ball's velocity just before it hits the floor? What is the horizontal component of the ball's velocity just before it hits the floor? A ball rolls off a platform that is 25 meters above the ground. The ball s horizontal velocity as it leaves the platform is 10 m/s. How much time does it take for the ball to hit the ground? How far from the base of the platform does the ball hit the ground? A projectile is fired at an angle such that the vertical componen

Explanation / Answer

1.

a)

consider the motion of bullet along horizontal direction

X = horizontal distance = 500 m

Vox = initial velocity = 800 m/s

t = time taken

t = X/Vox = 500/800 = 0.625 sec

b)

consider the motion in y-direction

Y = vertical displacement

a = acceleration = 9.8 m/s2

t = 0.625 sec

Voy = initial velocity = 0 m/s

using the equation

Y = Voy t + (0.5) a t2

Y = 0 (0.625) + (0.5) (9.8) (0.625)2

Y = 1.91 m

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