Question

Does it require more work to raise a 15 kg block by 4 m
or to raise a 20 kg block by 2 m, if both are moving at
a constant velocity? Draw a free-body diagram to help
solve the problem.

Answer 1

I have no clue sorry
But it’s probably c

Answer 2

The 15 kg block require more work to raise by 4 meter compare to  20 kg blocks .

The free body diagram is attached below,

We know that,  Weight $W=m*g$

where m is mass of object and g is gravitational acceleration.

Value of  $g=9.8m/s^{2}$

So that, weight is depend on mass of object.

And , $workdone=force*distance$

Work done require to raise 15kg block by 4 m is,

                 $W=15*4*g=60g$

Work done require to raise 20kg block by 2 m is,

               $W=20*2*g=40g$

Hence, The 15 kg block require more work to raise by 4 meter compare to  20 kg blocks .

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