question_answer

Which of the following is correct about the. girls moving the sack bags as shown in the above diagram?

1. Girl a has to work more against friction.

2. Girl b does not Slave to work against friction.

3. The wheels of the trolley have reduced the friction.

A)  1 only                         

B)  3 only             

C)         1 and 3 only  

D)         2 and 3 only