question_answer

A motor cycle starts from rest and accelerates along a straight path atAt the straight point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest?                                                                                     [AIEEE 2009] (Speed of wound)

A)  49 m   

B)       98 m

C)  147 m             

D)  196 m

Correct Answer: B

Solution :

[b]

Also,