Laws Of Motion Question 127
Question: A cylinder of 10 kg is sliding in a plane with an initial velocity of 10 m/s. If the coefficient of friction between the surface and cylinder is 0.5 then before stopping, it will cover. $ (g=10m/s^{2}) $ [Pb. PMT 2004]
Options:
A)2.5 m
B)5 m
C)7.5 m
D)10 m
Show Answer
Answer:
Correct Answer: D
Solution:
Kinetic energy of the cylinder will go against friction $ \therefore $ $ \frac{1}{2}mv^{2} $ =$ \mu \ mgs $ therefore $ s=\frac{u^{2}}{2\mu \ g}=\frac{{{(10)}^{2}}}{2\times (0.5)\times 10}=10m $
