Physics > Oscillations And Waves > Waves

A heavy ball of mass $M$ is suspended from the ceiling of a car by a light string of mass $m$ ($m \ll M$). When the car is at rest, the speed of transverse waves in the string is $60\ \text{ms}^{-1}$. When the car has acceleration $a$, the wave-speed increases to $60.5\ \text{ms}^{-1}$. The value of $a$, in terms of gravitational acceleration $g$, is closest to: