Question

44. The lengths of smooth & rough inclined planes
of inclination 45º is same. Times of sliding of
a body on two surfaces is t1,t2 and u=0.75,
then t,it2 =
1) 2:1
2) 2:3
3) 1:2 4)3:2​

Answer 1

Explanation:

For smooth surface acceleration is gsinθ.

For rough surface(friction appears) acceleration is gsinθ(1−μ) as angle of inclination is 45

0

Therefore for smooth surface, t

1

=

gsin45

o

2s

And for rough surface, t

2

=

gsin45

o

(1−0.75)

2s

So, t

1

:t

2

=1:2