Question

A donkey of mass 80kg is carrying a load of 100kg on its back and walked along a distance of 200m. What is the work done by the donkey? *​

Answer 1

Explanation:

Potential energy=mass×acceleration due to gravity x−height

P.E.=m×g×h

According to the given condition - 

m=80+20=100kg

g=9.8m/s2

h=25×40=1000cm=1m

P.E=Work Done=100×9.8×1=980J

Power is rate of work done =Time TakenWork Done=20980=49J/s=49Watt

Answer 2

Explanation:

Mass of donkey=80kg

mass of load=100kg

Total weight=180kg

distance=200m

W=F×S

But we don't have the FORCE.....therefore we have to find it.....

yes.....!! got the answer...

we have to find the POTENTIAL ENERGY....!!

the value of p.e =mgh

so, 180×9.8 × 200

therefore,the P.E= 352800J