question_answer

A body is moving at a speed near\[0.3\text{ }m{{s}^{-1}}\]. To measure its speed with an accuracy about 1%, using a sampling distance 3 mm, the measuring clock should have a least count of the order of:

A)  0.1 s                     

B)         0.01 s   

C)         0.001 s                

D)         0.0001 s

E)  0.015 s