please show step by step for both, thank you! 1. Which of the following is NOT t

Question

please show step by step for both, thank you!

1. Which of the following is NOT true of work? (A) It is the scalar product of force and displacement. (B) It is measured in joules (C) It has the same units as energy (D) It is a vector which is always in the same direction as the displacement. (E) It takes energy to perform work 2. A 4-kg box is pushed across a level floor with a force of 60 N for a displacement of 20 m, then lifted to a height of 2 m. What is the total work done on the box? (A) 200 J (B) 400 J (C) 11201J (D) 1200J (E) 1280 J

Explanation / Answer

1) D is not true.
It may or may not be the case. We always take the component of force in the direction of displacement.

2) W1 = work doby 60N force = 60x20 = 1200 J
   W2 = work done during lifting = change in KE = 0

   Total work done= 1200J

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