Answer:
intinal speed should be 10
Explanation:
v = v0 + at
30 = v0 +10.2
then v0= 10
The coefficient of kinetic friction for the rough horizontal surface is 0.66.
The given parameters;
- <em>mass of the object, m = 1 kg</em>
- <em>length of the inclined plane, L = 8 m</em>
- <em>angle of inclination of the plane, θ = 30⁰ </em>
- <em>distance traveled before hitting the spring, d₁ = 4 m</em>
- <em>distance traveled after hitting the spring, d₂ = 1.3 m</em>
- <em>the spring constant, k = 26.5 N/m</em>
Apply work-energy theorem; the work done the force of friction is equal to the energy stored in the spring.

Thus, the coefficient of kinetic friction for the rough horizontal surface is 0.66.
Learn more here:brainly.com/question/10063455
Answer:
<span>v=340 <span>m/s</span></span>
Explanation:
<span>f:frequency<span>(Hz,<span>s^<span>−1</span></span>)</span></span>
<span>λ:wavelength(m)</span>
<span>v:velocity<span>(<span>m/s</span>)</span></span>
<span>v=λ⋅f</span>
<span>v=1.36⋅<span>250</span></span>