A heavy ball of mass 
is suspended from the ceiling of a car by a light string of mass 
. When the car is at rest, the speeed of transverse waves in the string is 
. when the car has acceleration a, the wave-speed increases to 
. The value of 
in terms of gravitational acceleration 
, is closest to:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
JEE Main 2019
Wave speed 
when car is at rest 
Similarly when the car is moving with acceleration a
which is closets to 
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