Homework Answers
1) The correct option is :
a) A chemical reaction in the battery provides energy for the moving electrons.
As there exist a potential difference in the cathode and anode in the battery. The electrons moves towards the positive end because of this potential energy.
2) We know,
w = F.s
here, w = work done
F = frictional force= 7 N
s = displacement= 21 m
Now, the work done= 7×21= 147 N
The correct option is : a) 147 N
Please comment if you have any doubt and like if it helps.
Happy learning.
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