Question

A man drops a stone from the top of a tower . he hears the sound of the stone hitting the top of a 10 m high building after time 't' second. if the height of the top of the tower from ground is 55 m and the speed of sound in air is 333m/s then find the time after which he will again hear the sound (Take g=10m/s^2)​

Answer 1

Answer:

Explanation:

Ut+1/2at²=55m-10m=45m

0+1/2*10m/s²*t²=45m

t=3s

Now for him to hear the sound has to travell back by air hence

45m/330m/s=0.1363....s

Hence total time taken is

3s+0.1363..s=4.1363s ....approx