Question

how much force is needed to lift a 300 kg block up at 2 m/s^2? be careful there are two forces acting on the block.​

Answer 1

3543N OR 3540 N IN 3 SIGNIFICANT NUMBERS

Step-by-step explanation:

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-2943=300×2

F = 600+2943

F = 3543N or 3540 in 3 significant figures

Answer 2

Total force is 3600N

Step-by-step explanation:

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

m=300kg, a=2m/s2

F=300*2

=600N

Downward force F=mg

m=300kg, g=10m/s2

F=300*10

=3000N

The total force needed to lift the load is:

3000+600=3600N