Question

answer guys fast... ​

Answer 1

Given:-

• Initial velocity of Stone = 80m

• Height of Building = 80m

• Acceleration due to gravity = +10m/s²

• Speed of the Sound = 330m/s

To Find:-

• The Time when the Sound will be heard.

Formulae used:-

• s = ut + ½ × a × t²

• speed = Distance / time.

Now,

• → h = ut + ½ × a × t²

• → 80 = 0 × t + ½ × 10 × t²

• → 80 = 0 + 5t²

• → 80/5 = t²

• → 16 = t²

• → t = 4s.

☯The time taken by stone to reach the Pond is 4s.

☯we know that the sound will take time to produce.

Therefore,

• → speed = Distance / time

• → 330 = 80/t

• → t = 80/330

• → t = 8/33

• → t = 0.24

Therefore, The Sound of splash to reach the mouth of the Pond is 0.24s

Hence,

→ time when the sound will be heard = 4 + 0.24 → 4.24s

Hence, The time taken by sound to reach is 4.24s.

Answer 2

Answer:

0.24 sec . i hope you like this answer