Question

What is the final speed of an object that starts from rest and accelerates uniformly at 4.0 meters per second2 over a distance of 8.0 meters? 1. 8.0 m/s 2. 16 m/s 3. 32 m/s 4. 64 m/s

Answer 1

Explanation:8.0m/s

Answer 2

Considering that the acceleration is uniform
`a=4 (m/s^2)` we apply the equation

`v^2=v0^2+2as`
with zero initial speed

`v^2=2as`
and we obtain the speed

`v^2 =2*8*4 =64 (m/s)^2`
Thus
`v=8 (m/s)`