# How long does it take the particle to hit the y-axis?

1. When a particle is at the origin, it has a velocity given by vo = (12i + 15j)ms-1. It has a constant acceleration given by a = (-1.5i + 0.25j) ms-2.
(a) How long does it take the particle to hit the y-axis?
(b) At what point does it hit the y-axis?
(c) What is its velocity at the instant it hits the y-axis?

2. Not certain what to use or how to get started. I have never seen nor done a problem like this before. Please help.

3. Not certain what to use or how to get started. I have never seen nor done a problem like this before. Please help.

## The Attempt at a Solution

Related Introductory Physics Homework Help News on Phys.org
cristo
Staff Emeritus
This is just a projectile type question, written in vector form. Can you solve projectile questions? If so, then just start out as usual: draw a diagram, then write out the quantities you know in the vertical and horizontal directions, and what you want to find out. Then use an appropriate equation for kinematic motion to solve.

i'm still very xtremely confused, i honestly don't know how to start it at all

for the velocity it would be the square root of 15^2 + 12^2? which would be 19? and then for acceleration it would be the sqaure root of -1.5^2 + 0.25^2? which would be 1.5? am I completely off track?

so no way to help get me started?

cristo
Staff Emeritus