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Do the following problems, drawing a picture for each. Then write your answers.

a You exert a force of 25 newtons while you move a rock 15 meters. How much work did you perform?

b You move a box 5 meters and perform 900 joules of work. How much force did you apply to the box?

c You move a box by exerting 45 newtons of force. The total work performed was 2700 joules. How far did you move the box? d. You exert of force of 75 newtons on a rock. You push and you push, but you can’t budge it. You are exhausted! How much work did you perform?

d Let’s say a small person with a mass of 50 kg walks up two flights of stairs. A heavy person with a mass of 105 kg walks up the same stairs. Who did more work and why? (Hint: Remember that a newton of gravitational force (weight) is about equal to 100 grams.)

(all of them please) its science

Sagot :

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