JEE Main 2019 Physics question
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 60 ms. When the car has acceleration a, the wave-speed increases to 60.5 ms. The value of a, in terms of gravitational acceleration g, is closest to:
Answer: (B)
Solution
: ⇒ a ≈ 0.18g ≈ g/5.