question_answer

When a 1-5 kg weight is hung at one end of a 15 cm long spring, its length increased to 16 cm. What will be the length of the spring when a 6 kg weight hung at that end?                           

A) 19 cm              

B) 18 cm          

C) 21 cm              

D) 20 cm          

Correct Answer: A

Solution :

 Increment in spring after weighing 1-5 kg Weight = 1 cm  Increment in spring after weighing 6 kg weight                                        Required length = (15+4) cm                                            = 19 cm