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3 boys push a small car 25 m up a hill inclined at 19° to the horizontal. The car has a weight of 860 N and they push it at a steady speed of 0.5 m s-1 against an opposing force of friction of 70 N acting down the hill. enter image description here

  1. By considering all the forces acting on the car, calculate the net force.
  2. Determine the size of the boys' combined push force.
  3. Determine the combined average power output of the boys.!
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closed as off-topic by David Z Nov 9 '13 at 3:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – David Z
If this question can be reworded to fit the rules in the help center, please edit the question.

This question is really frustrating as the car shown (Skoda Fabia) weighs approximately 1200kg and the three boys would possibly be crushed trying to push it up such a steep hill. Please write to the authors of this textbook to revise the question. – Alexander Nov 9 '13 at 13:15