Question

A man fires a gun and hears its echo after 5s. The man moves 124m towards the hilla nd fires the guna agin

Answer 1

Answer:

2.3s

Explanation:

t=5s

v×t=2d

5v=2d

v=2d/5

now,d'=d-124

t=d'/v

=d-124/(2d/5)

t=5d-620/2d

d=v×t=344×5=1720m

t=5(1720)-620 / 2×1720

=8600-620 /3440

=7920/3440

=2.3s