Q1.A bat in a cave emits a sound pulse and receives an echo 0.22 second later. Assuming that the speed of sound is 339 m/s, how far did the sound (the longitudinal wave) travel during this time?
Q2. A baseball is hit nearly in a straight line up into the air with a speed of 41 m/s. How high it goes? And how long is it in the air?
Q3. Two charged spheres are 25.0 cm apart. They are moved, and force on each of them is found to have been doubled. How far apart are they now?