Explanation:
w=F×d 1kg=9.807N
p=w/t 400kg=9.807×400=3922.8N
p=Fd/t
=3922.8×20×1
power=78456 watt
..sorry..if the answer is not right..
A material that resists the flow of electrons is called an insulator.
For plato users, I just took the test and D is your correct answer!
D. Speed and direction, this is because velocity is a vector quantity so has a magnitude and direction assigned to it because it is the rate of change of displacement.