Work Energy And Power Question 231
Question: A man starts walking from a point on the surface of earth (assumed smooth) and reaches diagonally opposite point. What is the work done by him?
Options:
A) Zero
B) Positive
C) Negative
D) Nothing can be said
Show Answer
Answer:
Correct Answer: A
Solution:
[a] As surface is smooth so work done against friction is zero. Also the displacement and force of gravity are perpendicular so work done against gravity is zero.
