Register to reply

Projectile question - X and Y direction

by anthony123456
Tags: direction, projectile
Share this thread:
Apr5-12, 08:13 PM
P: 7
A bullet is fired at an angle of 60 with an initial velocity of 200 m/s. How long is the bullet in the air?

2. Relevant equations

Vix = Vicosθ
Viy = Visinθ

Vfy = Viy + ayΔt
Xf = xi + VixΔt

... Ask for more equations available....
3. The attempt at a solution

Vix = 200cos60 = 100m/s
Viy = 200sin60 = 173.2 m/s

X variables:
xi = 0m
xf = ?
Δt =?
Vix = 100m/s

Y variables:
Yi = ?
Yf = 0m
Δt =?
Viy = 173.2m/s
Vfy = ?
a = -9.8m/s

Phys.Org News Partner Science news on
Scientists develop 'electronic nose' for rapid detection of C. diff infection
Why plants in the office make us more productive
Tesla Motors dealing as states play factory poker
Apr5-12, 08:23 PM
P: 963
Relevant Equation
Apr5-12, 08:27 PM
P: 280
The question is unanswerable, because you are not given knowledge about the initial y-component position of the bullet or the landscape into which the bullet will travel.

But if we assume your teacher meant to describe a world in which bullets are fired from ground level into landscapes that are perfectly flat, we can proceed. If that is the case, Yi = 0. If you need additional help, just ask for it.

Register to reply

Related Discussions
Direction of acceleration in projectile motion Introductory Physics Homework 2
Magnitude and Direction of Velocity (projectile motion) Introductory Physics Homework 9
Projectile motion (magnitude and direction) Introductory Physics Homework 4
Magnitude and direction of change in velocity. Dont know how to get direction. Introductory Physics Homework 3
Direction of acceleration when direction of moving particle changes by 90 degrees? Introductory Physics Homework 6