. How much power is used to move a 5 kg mass 28 meters in 8 seconds?

171.5Watts

Explanation:

Given parameters:

Mass  = 5kg

Distance  = 28m

Time  = 8s

Unknown:

Power = ?

Solution:

Power is the rate at which work is done;

       Power  =

Work done  = force x distance = mg x d =

  m is the mass

   g is the acceleration due to gravity

   d is the distance

  Work done  = 5 x 9.8 x 28 = 1372J

     Power =   = 171.5Watts

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.