Answer :
The acceleration of the skateboard is [tex]-0.6 m/s^2[/tex] (to the left)
Explanation:
The motion of the skateboard is a uniformly accelerated motion, so we can use the following suvat equation:
[tex]v=u+at[/tex]
where
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
For the skateboard in this problem, choosing right as positive direction, we have:
u = +8 m/s is the initial velocity
v = +5 m/s is the final velocity
t = 5 s is the time
Solving for a, we find the acceleration:
[tex]a=\frac{v-u}{t}=\frac{5-8}{5}=-0.6 m/s^2[/tex]
And since the sign is negative, the direction is to the left.
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