A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of Then, the frequency of sound that the observer hears in the echo reflected from the cliff is :

A bus moving at a speed of 24 m/s begins to slow at a rate of 3 m/s each second. How far does it go before stopping?

A bus moving at a speed of 24 m/s begins to slow at a rate of 3 m/s each second. How far does it go before stopping?