A worker does work of 360 J against a friction force of 20 N in pushing a body with a uniform velocity for 4.5 s find the value of velocity?

a worker does work of 360 J against a friction force of 20 N in pushing a body with a uniform velocity for 4.5 s find the value of velocity

1 Answer
Apr 20, 2018

v= 4m/s

Explanation:

To maintain a net force of 0N in order to move at a uniform velocity, the force of friction must be counteracted, therefore the force applied by the person is 20N

W= Fd

Given that the work done is 30J
and the force applied is 20N

d= "360J"/"20N"

d= 18 m

And since this distance is covered at a constant velocity:
d/t=v

"18m"/"4.5s"=v

v= 4m/s