Question

a. calculate the work done by a force of 100 N that a body through a distance 5 m in the direction of force


b. the height of a tower is 10 m. what work a man of 70 kg does when he clims up the top

c. A laborer lifts a body of mass 10 kg to the roof of building 20 m high. how much work he performs against gravity?

Answer 1

a.work done = fscostheta
mass =100
s=5m
hence work is 500 joules
b. m=70
s=10
hence w= 70*10=700joules
c. m=10
s=20
therefore work done by lift is=10*20=200j
but since work done by g is asked..
w=-200j

hope this helps...