Kinematics Question 701
Question: A body of mass $ m $ is moving in a circle of radius $ r $ with a constant speed $ v $ . The force on the body is $ \frac{mv^{2}}{r} $ and it’s directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle[NCERT 1977; RPET 1999]
Options:
A) $ \frac{mv^{2}}{r}\times \pi r $
B)Zero
C) $ \frac{mv^{2}}{r^{2}} $
D) $ \frac{\pi r^{2}}{mv^{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
Work done by centripetal force is always zero.
