# Homework Help: Projectile motion(3)

1. Oct 2, 2009

### kevin948

1. The problem statement, all variables and given/known data

At time t = 0 s, a large rock is launched horizontally from a tall cliff at 5 m/s. Define a coordinate system with its origin located at the edge of the cliff, its x-axis aligned with the initial velocity of the rock, and its y-axis pointing upwards. Take the acceleration of gravity to be exactly 10m/s² (rather than 9.8 m/s²) to simplify the mathematics.

a) How fast is the rock traveling and how many meters away from the edge of the cliff is the rock after 2 seconds?

b) Complete the attached table (check the attached file)

2. Relevant equations

y=yi + Vyi △t +1/2ay △t²

3. The attempt at a solution

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2. Oct 3, 2009

### tiny-tim

Welcome to PF!

Hi kevin948! Welcome to PF!

Show us what you've tried, and where you're stuck, and then we'll know how to help!

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