Question

A body sliding on a smooth inclined plane requires 4 seconds to reach the bottom starting from rest at the top. How much time does it take to cover one-fourth distance starting from rest at the top ?
PLZ do with proper steps

Answer 1

Answer:

Suppose length of plane is L. When block descends the plane, rise in kinetic energy = fall in potential energy =mgLsinθi

Work done by friction =μ×(reaction)×distance 0+μ(mgcosθ)×(L/2)

=μ(mgcosθ)×(L/2)

Now, work done= change in KE

mgLsinθ=μ(mgcosθ)×(L/2)

⇒tanθ=μ/2

∴μ=2tanθ.

Explanation:

I hope it's helpful ✌

Please Mark Bainlist