Question

A rock falls for 4 seconds. How far did it fall

Answer 1

d = 80 m

Step-by-step explanation:

It is given that,

A rock falls for 4 seconds.

We need to find how far did it fall.

let it cover d distance.

Using equation of motion to find it :

`d=ut+(1)/(2)at^2`

Here, u = 0 (at rest initially)

a = g

`d=(1)/(2)gt^2\\\\d=(1)/(2)* 10* 4^2\\\\d=80\ m`

It will fall at a distance of 80 m.