A man pushes a block of 30 Kg along a level floor at constant speed with a force directed at 45° below the horizontal. If the coefficient of friction is 0.20, then:work done by all the forces exerted by the surface on the block in 20 meters is -1500 J. true Or false explain
why should We get negative 1500
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Answer:
yes it's correct
it's true
Explanation:
(1)freebody diagram can be drawn as
(2)and normal force and friction force can be given as
(3)
there are no any accelaration because it's moving with constant velocity
so work done can be given as
(4) there are no accelaration so work done by pull will be go into frictional loss it will be nagetive
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