# Free falling objects

## Homework Statement

A girl throws her set of keys to her friend upward who is in a window 3.90m above. the keys are caught later at 1.30s by the friends hand.

## Homework Equations

a. With what initial velocity were the keys thrown?
b. What was the velocity of the keys just before they were caught?

## The Attempt at a Solution

a. i tried finding change in x/change in t but got the wrong answer
b. i tried using a kinematic equation and solving for Vfinal but got the wrong answer...

LowlyPion
Homework Helper

## Homework Statement

A girl throws her set of keys to her friend upward who is in a window 3.90m above. the keys are caught later at 1.30s by the friends hand.

## Homework Equations

a. With what initial velocity were the keys thrown?
b. What was the velocity of the keys just before they were caught?

## The Attempt at a Solution

a. i tried finding change in x/change in t but got the wrong answer
b. i tried using a kinematic equation and solving for Vfinal but got the wrong answer...

Consider using the equation:

$$x = x_0 + v_0 t + (1/2) a t^2$$