Explanation:
increase the distance of cube from black and dull substance
They may be changed because they may find evidence of some thing that will change their perspective on things.
By v = u - at
<span>=>8 = 12 - a x 0.25 </span>
<span>=>a = 4/0.25 km/hr/sec </span>
<span>=>a = 16km/hr/sec
I hope this helped!</span>