Question

A stone is dropped from the edge of roof. 2 (i) How long does it take to fall 4.9m? (ii) How fast does it move at the end of the fall? (iii) How fast does it move at the end of 7.9m? (iv) What is its acceleration after1s and 2s? ​

Answer 1

Answer:

Solution :

(a) As the stone is dropped, its initial velocity,

, <br>

, time

<br> From

<br> (b) Finaly velocity,

at

<br> From

<br> (c) Let v be Final velocity when

. <br> From

<br> or

<br> (d) The accceleration of a freely failling body remains the same at all times, i.e,. <br>

, after 1 s and after 2 s.