Which of the following is correct about the girls moving the sack bags as shown in the given diagram?
1. Girl 'a' has to work more against friction.
2. Girl 'b' does not have to work against friction.
3. The wheels of the trolley have reduced the friction.
C1 and 3 only
D2 and 3 only
In both the case the girl experiance friction, thus the correct answer should be B