Ablock with an initial kinetic energy of 4.0 j comes to rest after sliding 1.0 m. how far would the block slide if it had 8.0 j of initial kinetic energy?

2.0 m

Explanation:

Kinetic Energy: This is the energy of a body due to motion.

According to the law of conservation of energy,

Kinetic Energy = potential Energy = mgs

Where m = mass (kg) , g = acceleration due to gravity (m/s²) , s = distance or height (m).

Kinetic energy = 4.0 J , s = 1.0 m , g= 9.8m/s² , m=?

∴ m = kinetic Energy/(gs)

 m = 4/(1 ×9.8) = 0.4081 Kg.

When the initial kinetic energy  8.0 J

∴ Distance (s) = 8.0/(0.4081 × 9.8)

    Distance (s) = 2.00031

     Distance (s) ≈ 2.0 m

∴  the block would slide 2.0 m

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

3. dark matter

empty space could also be a simple vacuum