- #1

- 347

- 2

## Homework Statement

A small object, of mass 0.02Kg is at the top of a tall structure 160m high, it is dropped from rest.

Ignoring air resistance..

1. Find the speed of the object as it hits the ground

2. find the time taken

## Homework Equations

So far we have learned the equations of kinematic motion

v=u+at

s=1/2(u+v)t

2s=(2u+at)t

v^2=u^2+2as

and forces such as

F=ma

Ns=mv-mu

## The Attempt at a Solution

I get and can do the math(I think) on this particular question I am a bit puzzled as to some of the phrases and what the variables would be and then what equations and resolving thereof to use.

The obvious ones are "s=160" "u=0" and "m=0.02". Im assuming that part 1 is asking for the final velocity (v) but cant figure out where to start.

If the acceleration was known then I could work out what the final velocity was, however how can I find the acceleration from just that?

Part 2 would be easy if I knew what either the acceleration or final velocity are.

Any help appreciated....I'm sure I'm just reading it wrong or something stupid like making it more complicated than it needs to be.