here is your answer ;)
-- In order to achieve constant verlocity, the net force on the mass must be zero. So if there ARE any forces acting on it, they must be balanced.
-- There is already a force on the mass that can't be eliminated . . . the force of gravity.
-- That force due to gravity is (mass x gravity) = (25 kg)(9.8 m/s²) = 245N in the downward direction.
-- In order to 'balance' the forces and make them add up to zero, we have to provide another force of 245N, all in the upward direction.
-- Then the forces on the object will be balanced, the NET force on it will be zero, and whichever way you start it moving, it will continue to move at a cornstant verlocity.
3543N OR 3540 N IN 3 SIGNIFICANT NUMBERS
Let F be the force which lifts body upward
in downward direction weight of the body acts .
weight = mass ×acceleration due to gravity
weight, W = 300×9.81=2943N
Now net force acting on body is F-W and according to second law of motion
F-W = m a where F is force W is weight m is mass and a is acceleration
F = 600+2943
F = 3543N or 3540 in 3 significant figures
f = 245 N
see the solution
g=9.8 N/Kg F=mg
f=x G=Gravitational Field Intensity(N/Kg)
F=0.2Kg (9.8N/Kg) F=Force of Gravity (N)
Total force is 3600N
The forces acting on the body are: the force causing upward motion and the downward force due to the weight of the body.
Upward force F=ma
Downward force F=mg
The total force needed to lift the load is:
where is the mass and is the gravitational acceleration. Substituting, we have
And therefore, the force F we have to apply must be at least equal to this value, in order to lift the object.
youre right there are