Consider the image above. vi = the initial velocity and vf = the final velocity. is there acceleration? explain your answer.

a)
no. the initial and final velocities are the same.

b)
yes. the ball had to slow down in order to change direction.

c)
no. acceleration is the change in velocity. the ball's velocity is constant.

d)
yes. even though the initial and final velocities are the same, there is a change in direction for the ball.

D) Yes. Even though the initial and final velocities are the same, there is a change in direction for the ball.
Acceleration (a) = change in velocity (v) over time (t), let's consider moving right is (+) and moving left is (-)
a = (vf - vi)/t = (-5 - +5)/t
a = (-10)/t
So even though the number looks the same from vi to vf, there actually is a negative acceleration of 10m/s/s.

To use anything transparent

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force