Laws Of Motion Question 334
Question: A body starts from rest on a long inclined plane of slope$ 45{}^\circ $ . The coefficient of friction between the body and the plane varies as$ u=0.3x $ , where $ x $ is distance travelled down the plane. The body will have maximum speed (For$ g=10m/s^{2} $ ) when $ x= $
Options:
A) 9.8 m
B) 27 m
C) 12 m
D) 3.33 m
Show Answer
Answer:
Correct Answer: D
Solution:
[d] When the body has maximum speed then
$ \mu =0.3x=tan45{}^\circ ~~~~\therefore x=3.33m $
