15. Starting from rest, an object rolls freely down an incline that is 10 m long in 2 s. The acceleration of the object is approximately?

a = 5m/s^2

Explanation:

Vi=0 m/s

ΔY=10m

Δt=2s

find acceleration

With the givens and the acceleration being the only one missing, we can safely use the Δy = Vi Δt + 1/2 a (Δt)^2 formula

Plug it in and we get:

10 = 0 x 2 + 1/2 a (2)^2

10 = a2

10/2 = a 2/2

a = 5 m/s^2

I hope this helps :)

it doesn't. it was imagined up in the middle ages.

3. dark matter

empty space could also be a simple vacuum