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**1. Homework Statement**

1. An automobile has a mass of 800 kg and is considered that the efficiency is 14%. (This is 14% of the energy in the fuel is delivered to the wheels). Find the quantity of gasoline used to accelerate the car from rest to 60 miles/h. Note: In this problem, one gallon of gasoline has 1,300,000,000 Joules.

2. A particle that has 501 KG has a speed of 25m/s in position A and a kinetic Energy of 40,000 joules in position B. Find the total work done when the particle moves from position A to B.

3. (and last) A person has 80kg and sustains himself on one end of a chord that has 12 meters and at the other end is struck on a building. The cable has 60 degrees with the horizontal reference. How much work is he doing against gravity?

**2. Homework Equations**

I really have no idea what would work in these, since I've tried everything and I still can't get it.

**3. The Attempt at a Solution**

As I said above, I've tried everything and it'd be a waste of time to post it here.

Thanks in advance!