two 30 kg children in a 20 kg cart are stationary at the top of a...
two 30 kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80 m tall hill and they are traveling at 30 km h^-1 when they reach the bottom. ( the cart had brakes!) How much work was done on the cart by friction during it's travel down the hill? (note the use of the word on and remember to specify the sign of the work done)
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two 30 kg children in a 20 kg cart are stationary at the top of
a...
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