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You carry a 7.0-kg bag of groceries 1.2 m above the ground at a constant speed accross a 2.7 m room. How much work do you do on the bag in the process

Question

You carry a 7.0-kg bag of groceries 1.2 m above the ground at a constant speed accross a 2.7 m room. How much work do you do on the bag in the process

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Step 1

Since the person is holding the bag and moving with constant velocity there will be  only one force  acting on ...

Work done is = (F cos 0)
(displacement)
0 is the angle between direction of force and direction of displacement
In this question force acting on the bag is in vertically upward direction and motion of the bag is
along horizontal direction
Therefore ,angle between direction of motion and direction of displacement is 900
Work done is (F cos 90)
(displacement)
Since cos(90)0
Work done is zero
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Work done is = (F cos 0) (displacement) 0 is the angle between direction of force and direction of displacement In this question force acting on the bag is in vertically upward direction and motion of the bag is along horizontal direction Therefore ,angle between direction of motion and direction of displacement is 900 Work done is (F cos 90) (displacement) Since cos(90)0 Work done is zero

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Work,Power and Energy

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