An object of mass 4kg falls from rest through a vertical distance of 20m and reaches with velocity 10ms-1 on ground. The work done by air friction is .
A. 800J
B. – 800J
C. 600J
D. – 600J
Answer:D
An object of mass 4kg falls from rest through a vertical distance of 20m and reaches with velocity 10ms-1 on ground. The work done by air friction is .
A. 800J B. – 800J C. 600J D. – 600J