Q

A car travels 120 meters north in 10 seconds and then instantly returns to its original position in the next 10 seconds. Which statement best describes the car's average velocity for the entire trip?

RRB JE 19/02/2026 / 4:30 PM - 6:00 PM 2026
✓ Answer: A The average velocity is zero because the displacement is zero.
The frequency of a sound wave is determined by its source and does not change when the wave enters another medium. Its speed and wavelength can change.