Physics · 2019
JEE Main · 9 January 2019, Shift 1 · Q13
A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m (m<<M). When the car is at rest, the speed of transverse…
A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m (m<<M). When the car is at rest, the speed of transverse waves in the string is $\displaystyle 60 \mathrm{~ms}^{-1}$. When the car has acceleration a, the wave-speed increases to $\displaystyle 60.5 \mathrm{~ms}^{-1}$. The value of a, in terms of gravitational acceleration g is closest to :
Official answer
(2)
$\displaystyle \frac{g}{5}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.