3. Two people stand facing each other 200 m apart on one side of a high
wall and at the same perpendicular
distance from it. When one fires a
pistol, the other hears a report 0.6
seconds after the flash and a second
sound 0.25 seconds later. Explain this
and calculate:
(a) Velocity of sound in air
(b) Perpendicular distance of the
people from the wall.​

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?