Question

An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches the ground with a velocity of 10 m/s the work done by air resistance is (take g = 9.8m/s)​

Answer 1

Explanation:

m=5kg

and distance from ground, d=20m

so work done= mass×displacement

f=ma

f=5×9.8

f=49N

as here is a case of gravity the displacement will be the distance between earth and body7

W=F×s (s=displacement )

W=49N×20m

W=980Nm

W=980J

asNm=Joule

hope it helps you

Answer 2

Answer:

W = 980 j

Explanation:

Thanks bro....